1-5 electrical
235 expressed in scientific notation would best be written as...
2.35 x 102
A series circuit with 3 lamps, each having a resistance of 200 ohms has an applied voltage of 30V. The current through the 3rd lamp would be.....
50 mA
A parallel circuit composed of a 10 Ω and a 22 Ω resistor. It has a voltage of 60 V. What is the current in the 10 Ω resistor?
6 A
The meter setting shown is used for measuring....
DC voltz
If you determine you have a bad fuse in your multimeter, you should...
Find the exact replacement fuse rated at an equal or higher Catagory rating than the blow fuse
What is one of the most common uses of an analog meter?
For tuning or adjusting circuits
The rate of electron flow in a circuit is measured in ___________.
amperes
The 3 basic parts of any circuit are the...
arc, load, path
One advantage of a digital multimeter over an analog meter is....
auto ranging capability
A ________________________ can be used to measure current, when exposed wires are available.
clamp on meter
A changing magnetic field induces an electrical current in a wire through a phenomenon called ___________________.
electromagnetism
Resistance opposes the flow of ____.
electrons
Coulomb's law of charges states that ____.
like charges repel and unlike attract
put these prefixes from smallest to largest:
pico, micro, milli, kilo, mega
Georg Simon Ohm
resistance
Resistor values (ohms) can be identified by the...
resistor color code
An ammeter is always connected in _____________ and is measured with the power ___________.
series-on
On a "range select" meter the range represents...
the highest value you can measure on that setting
This schematic shows the correct way to measure...
the voltage drop across R1
If two resistors have the same voltage drop in a series circuit, it means:
they are of equal value
What meter could be connected directly across the power source?
voltmeter
A parallel circuit composed of a 150 Ω and a 270 Ω resistor has a voltage of 120 V. What is the current in the 150 Ω resistor?
0.8 A
The number 40000 has how many significant digits?
1
A DC series circuit has an applied voltage of 24V and a current of 500mA, what is the power?
12V
Which battery configuration would produce the most voltage?
6 C carbon-zinc batteries connected in series
A two-resistor series circuit has an applied voltage of 100 V. The voltage drop across one of the resistors is 40 V. What is the voltage drop across the other resistor?
60V
Calculate the current of a simple circuit with 200 Ω of resistance supplied by a 12 V battery.
60mA
What are 3 functions of a Digital Multimeter?
Conver electrical signals into understandable values Perform accurate electrical measurements Enable testing of sensitive electronic ciorcuits
Which of the following statements are true concerning current?
Current is a measure of electron flow The symbol for current is A or I Current is dependent on the voltage applied, and the resistant load of a circuit.
Which of the following is not a component of a basic circuit?
Insulator to control electricity delivered
The voltage across any branch of a parallel circuit:
Parallel Circuits - Electronics Questions and Answers is equal to the applied voltage
Which 2 properties are true of electrical insulators?
They have 5-8 electrons in their outer band. They are generally compounds.
Which of the following would be a description of VOLTAGE?
Voltage is the difference in the number of electrons a 2 points in a circuit. Voltage is a measure of electromotive force. Voltage is designated by the letter V or E.
How will the open affect this series circuit? Assume 10VDC applied voltage.
Voltage measured from point A to point B will be 10VDC No current will flow in the circuit.
What meter is used with the power off?
an ohmmeter
A complete circuit is often referred to as a (an) _____ circuit.
closed
The resistance of a conductor is dependent on its _____________
length, material, cross-sectional area
At a high enough voltage as little as ___________ AC current can kill a human being.
less than 100mA
A voltmeter is connected in ____________ with the load and the power should be _________.
parallel-on
The orientation of voltage (+) and (-) is also know as ______________
polarity
What type of resistor is shown here?
potentiometer variable resistor
Which materials are good conductors?
silver, lithium, gold
Kirchhoff's voltage law states that:
the sum of the voltage drops in a series circuit is equal to the total applied voltage
true or false: Atoms normally have no net charge because the number of electrons and protons are equal.
true
Which is the largest resistor (it's ability to limit current)?
.5 MEG ohm
An electrical circuit has a voltage of 50 V and a resistance of 5K Ω. What is the current?
10mA
A series circuit has two resistors that dissipate 10 W and 15 W, respectively. What is the total power dissipation of the circuit?
25 V
A series circuit has a total resistance of 180 Ω and an applied voltage of 120 V. What is the current flow?
667 mA
Two test should be done before using a digital multimeter. They are...
Check the test leads for external damage like Check the continuity of the test leads
Which of the following would be true of RESISTANCE?
Measured in ohms, K ohms or MEG ohms. Is a measure of electron impedance which limits flow. Is usually associated with the load of a circuit.
When parallel resistors are of three different values, which has the greatest power loss?
The smallest resistance
Which combination of meter and leads would provide the safest metering situation where you wold be measuring voltage up to 500V
a CAT III-600V meter and CAT III leads
What is the combination of elements and compounds called?
a mixture
If the resistance total in a series circuit doubles, and voltage does not change, current will:
be halfed
In Ohm's law, I represents ____.
current and electron flow
A string of resistors in a series circuit will:
divide the source voltage in proportion to their values
A voltage __________ uses resistors in series, to create different voltages within a circuit.
divider
In a series circuit, the sum of the voltage drops is _____ the applied voltage.
equal to
true or false: Insulators are considered good conductors since they allow electricity to flow through them easily.
false
The very first meter movements were called...
galvnometers
A DVM has a high ___________________________ to minimize the _________________ flow (or draw) which limits the affect the meter has on the circuit.
impedence, current
_______________________charged electrons orbit around the nucleus.
negatively
a short circuit
no resistance
James Watt
power
A circuit that has only one path for current flow is a _____ circuit.
series
In a parallel circuit, the total current flow is equal to the ________ of the currents through all the branches. Find the answer to fill in the blank, and the person who developed this law.
sum
Alessandro Volta
voltage
A test meter that uses a scale and pointer to indicate values is a(n) _____ meter.
analog
Andre M. Amphere
current
The outer shell of an atom is called the ____________ shell.
valence
What force pushes the electrons through a resistance in a circuit?
voltage
Energy used by a circuit as current passes through a load (resistance) results in .....
voltage drop
All resistors have a power rating, sometimes called a ____________ rating to indicate the maximum amount of current the resistor can handle.
wattage
What type of resistors are generally used when a high power rating is needed?
wire-round
Calculate the voltage of a simple circuit containing a 500 Ω resistor and drawing 10 mA of current.
5V
An electric motor is running on 12 VDC. The current is measured to be 200 mA. What is the resistance of the motor?
60 ohms
A series circuit has a total resistance of 240 Ω and a current flow of 4 A. What is the applied voltage?
960 V
Given a series circuit containing resistors of different values, which statements are true?
The current through each resistor is the same. The total resistance is the sum of the value of the resistors. The voltage drop across each resistor will be different
Which 2 statements are true concerning WIRE SIZES?
The larger the gage number the smaller the wire diameter The thicker the wire the lower the resistance
One of the dangers of working on energized equipment is...
arc flash
Materials that permit many electrons to move freely....
are called conductors. have 3 or fewer electrons in the outer band. are generally metals.
A complete path from the negative terminal to the load and then from the load to the positive terminal is referred to as a ________
complete circuit
The measure of electrical CHARGE is the ______________.
coulumb
The field surrounding a charged object is referred to as a(n) __________ field.
electrostatic field
The 3 forms of matter are:
elements, compounds, mixtures
Which 3 things can be associated with voltage?
it is an electrical force it is caused by a potential difference in electrons the symbol used to represent it is V or E
Which 3 properties are true of ELECTRICAL GROUND?
it is the ZERO voltage reference point for circuits. it can be attached to the earth. In a car it would be an attachment to the chassis.
In a parallel circuit, the total resistance is _________________ .
lower than the smallest resistor.
Which 3 properties describe an electron?
orbit nucleus, have negative charge, The closer they are to the nucleus the more tightly bound they are to the atom.
Which subatomic part of an atom is positively charged?
proton
The atomic number of an atom is based on the number of ___________________.
protons
What are the individual values of two parallel resistors whose RT is 8 ohms, when one has double the resistance of the other?
12 ohms and 24 ohms
An electric circuit has a resistance of 20 Ω. The current is measured to be 6 A. How many volts are applied to the circuit?
120V
Which 2 statements best describe an element?
is the "basic building block" of nature it cannot be reduced to a simpler substance by chemical means
The most COMMON method of producing electrical voltage is....
magnetism