Physics Part 3 Unit 2

What is the total resistance of in a circuit that has three resistors, 2 Ω, 3 Ω, and 5 Ω that are wired in parallel?

0.968 Ω

Voltage is 10 V, resistance is 10 ohms. What is the current?

1 ampere

What is the total capacitance of a circuit with two series capacitors that each have a capacitance of 2.0 × 10-6 F?

1.0 × 10-6 F

If three resistors are wired in parallel and they have a resistance of 2 ohms, 3 ohms, and 4 ohms, respectively, what is the total resistance?

1.08 ohms

What is the current flowing in a 5 ohm resistor attached to a 9 V power source?

1.80 A

Voltage is 10 V. Resistance is 1000 ohms. What is the current?

10 milliamperes

What is the total resistance of in a circuit that has three resistors, 2 Ω, 3 Ω, and 5 Ω that are wired in series?

10 Ω

Resistance is 20 ohms, current is 5 amperes. What is the voltage?

100 volts

Resistance is 25 ohms, current is 5 amperes. What is the voltage?

125 volts

What is the power needed to generate 0.15 A with 110 V of electrical potential?

16.5 W

What is the voltage across a 6 ohm resistor that has a current of 3 amps across passing through it?

18.0 V

Two resistors, 4 ohms and 2 ohms, are in series on one branch of a parallel circuit. The other branch has a 3 ohm resistor. What is the total resistance of the circuit?

2.0 ohms

What would be the capacitance of a parallel plate capacitor with two 0.50 m2 plates that are separated by 0.025 m of paper (k = 1.5)?

2.66 × 10^-10 F

Voltage is 40 V, current is 2 mA. What is the resistance?

20 kohms

What is the current in a circuit that has a 12 V battery attached to a 4 Ω resistor?

3 A

What is the total capacitance of a circuit with two parallel capacitors that have a capacitance of 1.5 × 10-9 F?

3.0 × 10^-9 F

Voltage is 30 V. Resistance is 1000 ohms. What is the current?

30 milliamperes

How long will it take to move 4.81 × 10^19 electrons through a circuit with a current of 8.59 A?

4.81x10^19 / 6.24x10^18 = 7.71 C I = Q/t 8.59 = 7.71/t t = 0.898 s

Two resistors, 3 ohms and 2 ohms, are in a parallel branch that is in series with a 4 ohm resistor. What is the total resistance of the circuit?

5.20 ohms

What is the charge held by 3.56 × 1020 electrons?

57.1 C

How many electrons are in one coulomb of charge?

6.24x10^18 electrons

How many electrons flow in 1 second with 1 ampere of current?

6.24x10^18 electrons

What is the current needed to move 20 coulombs of charge in 3.2 seconds?

6.25 A

If three resistors are wired in series and they have a resistance of 2 ohms, 3 ohms, and 4 ohms, respectively, what is the total resistance?

9 ohms

How is a battery a supplier of electromotive force?

A battery does work on charges.

How do voltage and current relate?

A larger voltage can pump out a larger current.

How does electrical potential energy difference relate to current?

A larger voltage can pump out a larger current.

How does voltage relate to current?

A larger voltage can pump out a larger current.

Why does the light bulb need a wire connection from the battery to light up?

A wire provides a pathway for current to flow

Describe Kirchhoff's Current Rule as it applies to the entire circuit and each resistor.

According to the essential instruction, "the sum of all currents entering any junction point is equal to the sum of all the currents leaving that junction point." The current at each point remains constant and in a circuit, the current flowing through the battery of the system must be the same as the current flowing through the lamp.

How does electromotive force relate to current?

An emf produces electrical potential energy difference which increases the potential current.

Which of the following statement best describes electric current in a circuit?

Current is the flow rate of the charges in the circuit.

Which of these is not a correct relationship between voltage (V), current (I), and resistance(R)?

I = VR

Which of the following is the best description of Kirchhoff's Current Rule?

Kirchhoff's Current Rule states that the total current into a junction equals the total current exiting the junction.

Which of the following statements is the best description of Kirchoff's Voltage Rule?

Kirchhoff's Voltage Rule states that the voltage consumed in the circuit components equals the voltage supplied.

Which scientist is honored by the unit for capacitance?

Michael Faraday

Which of the following statements best describes Ohm's Law?

Ohm's Law states that the current times the resistance equals the voltage.

How does the electrical potential energy difference and resistance relate?

Potential energy difference equals the product of current and resistance

A wire has a resistivity of 2.20 × 10-7 Ωm and has a length of 40 m and a cross sectional area of 0.02 m2. What would the resistance be? Show all work and include units for full credit.

R = P (L/A) R = 2.20x10^-7Ω (40m / 0.02m^2) R = 4.4x10^-4 Ω

How does resistance relate to the cross sectional area of the material?

Resistance decreases with larger cross sectional area.

Which of these statements describes the dependance of resistance on the length of the material?

Resistance increases if the material is longer.

How does resistance relate to current?

Resistance reduces the current that can flow from a voltage

How do resistance and voltage relate?

Resistance reduces the current that can flow from a voltage.

How does current relate to resistance?

Resistance reduces the current that can flow from a voltage.

Distilled water is known as a fair material for use as a dielectric, but tap water would not be good for that purpose. Why can distilled water be a dielectric but tap water cannot?

Tap water contains ions from dissolved salts and other minerals making it less able to polarize in the presence of an electric charge. Distilled water does not contain any of these ions and has a better ability to polarize.

Describe the relationship between voltage, current, and resistance in a circuit.

The current flowing in a system is inversely proportional to the resistance and proportional to the voltage. Voltage is equal to current times resistance. Current is equal to voltage divided by resistance. Resistance is equal to voltage divided by current.

Which statement describes the voltage and current through each resistor in a series circuit?

The current is constant through each resistor and the voltage is proportional to the resistors.

Which statement describes the voltage and current through each resistor in a parallel circuit?

The current is proportional to each resistor and the voltage is constant through each resistor.

What does Kirchoff's Voltage Rule mean for the current going through each resistor?

The current is proportional to the resistance.

Which of the following is best describes the electromotive force (emf)?

The emf is the work done to the charge to create the potential difference.

What is electric potential energy difference (potential difference) as it relates to a circuit?

The potential difference is the amount of voltage supplied to a circuit.

Which of the following statements best describes the total voltage and total current in a series circuit?

The total current and total voltage are proportional to the total resistance in the circuit.

What does Kirchoff's Current Rule mean for the total voltage in a circuit?

The total voltage is equal to the sum of the voltage drops across each resistor.

What does Kirchoff's Current Rule mean for the voltage going through each resistor?

The voltage drop will be proportional to the resistance in each resistor.

What does Kirchoff's Voltage Rule mean for the total voltage in a circuit?

The voltage going through each branch will be the same as the power source.

What does Kirchoff's Voltage Rule mean for the voltage going through each branch?

The voltage is the same going through each branch of the circuit.

How does voltage relate to resistance?

The voltage of the battery is not affected by resistance in the circuit.

What is the voltage across a 6.5 ohm resistor if a current of 4 amps goes across it? What would the current be if the voltage is 12 V? Show your work for full credit.

V = IR V = 4(6.5) V = 26 V I = V/R I = 12/6.5 I = 1.85 amps

Which of the following statements correctly describes a parallel circuit?

Voltage is constant over each branch, but the current is different.

Which of the following statements correctly describes a series circuit?

Voltage is different across each resistor, but the current is constant.

What is not a difference between electromotive force (emf) and voltage?

Voltage is related to current, but emf is not.

How is energy transformed from fuel into electricity?

When we burn fuel it creates heat that causes the fuel to combust to power a turbine, which then spins a generator to create electricity.

What is the primary source of electric current for the operation of a car when the engine is running?

alternator

What material is most commonly used for the plates of a parallel plate capacitor?

aluminum

What is the term for a process that uses the heating of a fuel that allows for an engine to be able to operate?

combustion

What are the units of charge?

coulombs

What are the units used to measure electric current?

coulombs/second

Which of the following is not a common voltage source?

electric heater

A capacitor will charge at a constant rate until it is fully charged.

false

A set of light bulbs is a source of voltage.

false

In Faraday's research, if the switch was left open for an extended period of time and it was kept that way, the galvanometer was still able to detect current.

false

Resistance can be increased by using a piece of the material with a larger cross-sectional area.

false

What is electric current?

flow of electric charge

Which of the following best describes electric current?

flow of electric charge

Which way does electric current flow?

from high electrical potential to low electrical potential

This tissue includes: parenchyma, collenchyma, and sclerenchyma cells.

ground tissue

Which of the following statements best describes electric resistance?

inhibition of the flow of current

What are the units of energy?

joules

Which is an alternate term for electrical potential energy?

joules/coulomb

What force generates the electric current in a Faraday's experiment?

magnetic

Which of these is not a cleaner technolgoy as a voltage source?

oil-fired electric generator

Which of the following is not a source of alternative energy?

power plants

Why is electric current like a mountain stream?

the flow depends on a potential energy difference

Which of the following statements best describes electric current?

the flow of electric charge

Which of the following statements is the best description of electrical potential difference?

the work needed to move a charge from a lower position to a higher position in the electric field

Select the correct meaning for the following Compound Prepositions: En lugar de...

the work needed to move a charge to a higher position in the electric field

Which of the following statements best describes electric potential energy?

the work needed to move a charge to a higher position in the electric field

Which of the following was not a component of Faraday's apparatus?

thermometer

Which of the following is not a common voltage source?

transformer

Which is these is not a source of voltage?

transformers

All materials exhibit some level of resistance.

true

Current is the voltage divided by the resistance.

true

Electromotive force is a synonym for voltage.

true

Faraday was able to utilize magnetic induction as a source of emf.

true

Ohm's Law characterizes the relationship between joules/coulomb, ohms and the rate of charge flow.

true

Superconductors are materials that exhibit little or no resistance to current flow.

true

The electrical potential energy difference drives the current flow.

true

What are the units of electrical potential energy?

volt

What are the units of electromotive force?

volts