955 Test Practice Electricity - Electric Circuits -
A light bulb with the following information is given: 10V, 4W.What is the current flowing through the light bulb?
0.4 amps
Base your answer to the following questions on the figure below: What is the current at R1?
0.5 A
A light bulb's power is given as 4W. The bulb's resistance is 16Ω. What will the current flowing through the light bulb be if put under the optimal voltage ?
0.5A
A resistor of length L, cross- sectional area A and a resistance R are represented below. What will the resistance be after doubling the cross-sectional area of the resistor?
0.5R
The power factor of an AC power system may NOT be:
1.5
Base your answer to the following questions on the figure below: what is the current at R3? A 5 A B 0.5 A C 1.5 A D 2/3 A
1.5 A
If three resistors of 6, 3, and 2 Ω are in a series circuit, their total resistance will be:
11 Ω
Base your answer to the following questions on the figure below: The voltage of the circuit is:
120 V
Base your answer to the following questions on the figure below: What is the voltage drop across R3?
120 V
What is the capacitance of the equivalent capacitor (condenser) of the circuit shown in the diagram below?
12mF
If read clockwise, what is the ratio of voltage drop on the resistors?
1:2:3
Base your answer to the following questions the figure below: If switches 1 is closed while switches 2 and 3 remain open, how many light bulbs would light up?
2
Base your answer to the following questions on the figure below: What is the current flowing through R2?
2 A
A circuit with an unknown resistance is shown in the diagram below. What amount of resistance is required in order for the light bulb to work in accordance with the voltage written on it? It is known that the required current is 4 Amps and the light bulb's resistance is negligible.
2.5 ohms
In an 110V electrical system there are three appliances: appliance A (550W) appliance B (770W) and appliance C (330W). Given that all appliances operate simultaneously, what is the minimal required fuse rating?
20A
Base your answer to the following questions on the figure below: The total resistance of the circuit is:
24 Ω
A light bulb with the following information is given: 10V, 4W. What is the resistance (Ohm) of the light bulb?
25 ohms
A resistor of length L, cross- sectional area A and a resistance R are represented below. What will be the resistance after doubling the length of the resistor?
2R
Base your answer to the following questions the figure below: If switches 1 and 3 are closed while switch 2 remains open, how many light bulbs would light up?
3
If the electrical switch is turned on, which light bulb will light up?
3
Base your answer to the following questions on the figure below: If an additional resistor, with a resistance of 30 Ω, was added to the circuit in series - what would be the current flowing through R2?
3 A
Base your answer to the following questions on the figure below: What is the current at R2?
3 A
Base your answer to the following questions on the figure below: The three bulbs in the figure has the same resistance, R. What would be the total resistance of the circuit?
3R
Base your answer to the following questions on the figure below: What is the current flowing through R1?
4 A
Base your answer to the following questions on the figure below: What is the total current flowing through the circuit?
4 A
If three resistors, one of 20 Ω, one of 5 Ω, and one of 2 Ω, are in a parallel circuit, their total resistance will be:
4/3 Ω
Base your answer to the following questions on the figure below: What is the current flowing through R1?
5 A
Which of the following electric devices will be less safe to use?
50 volts voltage, 0.2 ampere current
Base your answer to the following questions on the figure below: What is the ratio of branch currents 1,2,3 respectively?
5:2:4
What is the ratio of branch currents 1,2,3, respectively?
5:2:4
A resistor of length L, radius of cross- section r and resistance of 20Ω are represented below. What will be the resistance of a new resistor of 2r radius?
5Ω
Base your answer to the following questions on the figure below: If R3 was removed, what would be the total current flowing through the circuit?
6 A
What is the ratio of currents through the resistors?
6:3:2
In a closed circuit where three resistors are connected in parallel, which of the following would increase the circuit's total current? Increase ones resistor's resistance Reduce battery's voltage Add bulb on separate branch None of the above
Add bulb on separate branch
Which of the following changes will increase the current measurement at point Y? Increase one bulb's resistance Reduce battery's voltage Add bulb on separate branch Neither option
Add bulb on separate branch
Which of the following values is a vector (has a size and a direction)? Current Force Magnetic field
All the above
Which of the following is a measurement unit for electric current?
Ampere
Which of the following sentences is correct?.
An anode is a type of electrode.
In the circuit shown below, a resistor, R, is connected in series to an ammeter. Which of the following statements is correct? The question has not been answered
B is the anode and A is the cathode
A parallel circuit consists 4 branches, A, B, C, and D. Branch A has a resistor of 50 Ω, Branch B has a resistor of 30 Ω, branch C has a light bulb with a resistance of 30 Ω, and branch D has a light bulb with a resistance of 10 Ω. Which branch will draw the most current? Branch A Branch B Branch C Branch D
Branch D
Which of the following is correct if we add a third, parallel, bulb to the circuit with the same resistance? Before: After: Bulb A's current will decrease Bulb A's current will increase Bulb A's current will stay the same Bulb A's current will increase and then decrease Cannot tell
Bulb A's current will stay the same
All three bulbs depicted in the circuit are identical. Between which two points is the electrical potential difference the greatest?
C and A
Base your answer to the following questions on the figure below: Between which two points is the electrical potential difference the greatest?
C and A
Which of the following is an electrical component used to temporarily store electrical energy in an electric field ?
Capacitor
What is an electric current?
Charge per time units
In which of the circuits will electrical current flow?
Circuit 1
In which of the following circuits will the light bulb light up?
Circuit B
In which of the circuits shown in the diagrams below will the intensity of illumination be the lowest?
Circuit C
A radio that operates with a potential voltage of 5 Volts is given. In which of the following circuits, shown in the diagrams below, will the radio work?
Circuits C and D
A circuit in which V1 < V2 is given in the diagram below. Which of the following actions should be taken in order to protect the light bulb and have it on?
Connecting a resistor in series with the light bulb.
Which of the following materials is considered a good conductor? Glass Copper Wood Pure water Plastic
Copper
Which of the following is a measurement unit for electric charge?
Coulomb
What instrument is used for measuring electric charge? The question has not been answered
Coulometer
Complete the following: Should the resistance of the bell located between points A and B increase, the current going through the second bell will ___.
Decrease
Which fan, in the diagrams below, will revolve faster?
Diagram B
Which of the following components restricts the electric current flow to a single direction?
Diode
Which of the following components restricts the electric current flow to a single direction? Condenser Diode Resistor Transducer Switch
Diode
What does an Ammeter measure?
Electric current
The rate at which electric energy is transferred by an electric circuit is defined as:
Electric power
What is the measuring unit for electric capacitance?
Farad
In which direction does the electric current flow in an electric circuit?
From the positive terminal to the negative terminal.
Which of the following changes will decrease the current in bulb C? Decrease Bulb A´s resistance Increase Bulb C's resistance Increase battery's voltage Either option
Increase Bulb C's resistance
In a closed circuit where three resistors are connected in parallel, which of the following would decrease the current in one of the resistors? Decrease another resistor's resistance Increase that resistor's resistance Increase the battery's voltage All of the above
Increase that resistor's resistance
Megohmmeters are normally used to test:
Insulation
What is expected to happen to a circuit's total resistance when an additional resistor is added in parallel?
It will decrease
What is expected to happen to a circuit's total resistance when an additional resistor is added in series?
It will increase
In the circuit below, Rx is a potentiometer (resistor with a changeable resistance), while r is a resistor connected in series to the potentiometer. Where should the mobile contact be placed (on the potentiometer) in order for the bulb to illuminate the strongest?
M
Which of the following is not a good insulator? Pure water Air Glass Mineral Water Plastic
Mineral Water
Complete the following: If 4 Coulombs of charge flow past point A in 2 seconds, then ___ Coulombs of charge flow through point B in 4 seconds.
More than 4
What is the direction of the electrical current in the circuit below? The question has not been answered
No current will flow
In the circuit below, how many bulbs will light when switch II and III are closed, but switch I is open?
None
Base your answer to the following questions on the figure below: In which point would the electric current be greater than in point D?
None of the above
Which of the following is a measurement unit for electric resistance?
Ohm
Impedance is measured in:
Ohms
In which of the following options will the light bulb light up?
Option D
Base your answer to the following questions on the figure below: The three resistors in the image are connected in:
Parallel
A circuit with an unknown resistance R is shown in the diagram below. In addition it is given that: V1 < V2. At which point in the circuit would it be desirable to connect the wire in order to provide the light bulb with maximum protection?
Point A
Base your answer to the following questions on the figure below: What would increase the current's measurement at point D?
Reduce one bulb's resistance
What changes to the electrical circuit would increase the current measurement at point D?
Reduce one bulb's resistance
A set of point charges is given as shown in the diagram below. In which direction will the point charge q1 move?
Right
An ohmmeter is connected across an inductor and the pointer indicates zero ohms. The inductor is:
Shorted
Which of the following is an electric component that can break an electric circuit by interrupting the current or diverting it from one conductor to another? Condenser Diode Resistor Transducer Switch
Switch
Which of the following is an electrical component that can break an electrical circuit, interrupting the current or diverting it from one conductor to another? Condenser Diode Resistor Transducer Switch
Switch
Base your answer to the following questions the figure below: Closing which of the following switched will cause exactly three bulbs to light up?
Switches 1 and 2
Which switches must be closed so that exactly three bulbs would light up?
Switches 1 and 2
What is the measuring unit for a magnetic field?
Tesla
A series circuit consists of 3 resistors with the following resistances: Resistor A - 50 Ω;Resistor B - 40 Ω;Resistor C - 60 Ω.Through which resistor will the current be the highest?
The current will be identical in all resistors
An electric circuit consists of a battery and a copper thread which is connected in parallel to a rubber thread. What will happen ?
The current will flow through the copper thread but not the rubber thread
A circuit is shown in the diagram below. If a light bulb is added to socket B, what will happen to the light produced by light bulb A?
The light will remain the same
In the circuit below, how many bulbs would be lit up if switch I were closed and switch II were open?
Three
Regarding the same circuit as in the previous question, how many bulbs will light when the two switches are closed but bulb c is removed (without connecting the ends that were connected to bulb c)?
Two
Which of the following is a measurement unit for electric potential?
Volt
The difference in electric potential between two points is called:
Voltage
Which of the following is a measurement unit for electric power?
Watt
What instrument is used for measuring electric power?
Wattmeter
