Question 1

If there was a current flow of 6 A in a 120-V circuit, the resistance of the circuit would be ____________________ Ω .

Accepted Answer

The answer of If there was a current flow of...

Question 2

The unit of measure for resistance is the ____________________.

Accepted Answer

The answer of The unit of measure for resistance is...

Question 3

____________________ are used to measure the intensity of current flow in a circuit or a particular branch in a circuit, so they are wired in series with the circuit being evaluated.

Accepted Answer

The answer of ____________________ are used to measure the intensity...

Question 4

Three electric heating elements are connected in parallel with each other and each element draws 7 A. The supply voltage is 210 V . 
a) What is the resistance of each heater? 
b) What would the current be through each of the two remaining heaters if one heater burns out?

Accepted Answer

The answer of Three electric heating elements are connected in...

Question 5

A PTC thermistor causes the resistance of the thermistor to increase when its temperature rises.

Accepted Answer

PTC thermistors have a positive temperature coefficient, meaning they increase in resistance as their temperature increases.

Question 6

A good conductor of electricity has  few ____________________ electrons which can move easily from one atom to another.

Accepted Answer

The answer of A good conductor of electricity has  few...

Question 7

A heat sink is a device to improve the purity of the electrons in an electrical circuit.

Accepted Answer

A heat sink is a device that is designed to dissipate heat and improve thermal conductivity, it is not related to improving the purity of electrons in an electrical circuit.

Question 8

What is the difference between AC and DC current?

Accepted Answer

The answer of What is the difference between AC and...

Question 9

A transformer has 10,000 turns of wire in the secondary and 100 turns in the primary. The transformer is connected to a line voltage of 120 V. The output voltage will be ____________________ volts.

Accepted Answer

The answer of A transformer has 10,000 turns of wire...

Question 10

The main purpose of a rectifier is to convert direct current (DC) to alternating current (AC).

Accepted Answer

The main purpose of a rectifier is to convert alternating current (AC) to direct current (DC).

Question 11

A single diode can be connected as a full wave rectifier.

Accepted Answer

A single diode can only be used for half-wave rectification, as it allows current to flow through it in only one direction. For full-wave rectification, at least two diodes are needed in a center-tapped configuration, or four diodes in a bridge rectifier configuration.

Question 12

Copper wire sizes are measured in circular mils.

Accepted Answer

Copper wire sizes are commonly measured in circular mils, which is a unit of cross-sectional area used to describe the size of a wire.

Question 13

The unit of measure for the current flow of electrical energy is the ____________________.

Accepted Answer

The answer of The unit of measure for the current...

Question 14

The unit of measure for the electrical pressure forcing electrical energy through a conductor is the ____________________.

Accepted Answer

The answer of The unit of measure for the electrical...

Question 15

What is the total current in a circuit that has two electric heating elements that have resistances of 5 Ω and 20 Ω? The elements are connected in parallel with each other and are connected to a 200-V power supply .

Accepted Answer

The answer of What is the total current in a...

Question 16

Write the three forms of Ohm's Law.

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The answer of Write the three forms of Ohm's Law....

Question 17

A solid state device that allows electrical energy to flow through in only one direction is called a(n) ____________________.

Accepted Answer

The answer of A solid state device that allows electrical...

Question 18

If ten 60-W light bulbs are wired in parallel with each other and are connected to a 120-V power supply, what will a voltmeter read if connected across any one bulb ?

Accepted Answer

The answer of If ten 60-W light bulbs are wired...

Question 19

Why is rubber a good insulator?

Accepted Answer

The answer of Why is rubber a good insulator?...

Question 20

When checking a diode with an ohmmeter and the meter shows a resistance, if the meter leads are reversed, it should show infinity .

Accepted Answer

This is because a diode allows current to flow only in one direction, so when the meter leads are reversed, the current cannot flow and the resistance appears to be infinite.

Quiz 12: Basic Electricity and Magnetism