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Question:

AM radio stations broadcast in which frequency range?

A 530–1,700 kHz

explanation

Frequencies are measured in kilohertz, megahertz, or gigahertz. AM radio stations broadcast in the 530–1,700 kHz range.

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What color is Neutral wire?

White

The neutral wire is whitish (or natural) colored.

A fuse rated at 0.8 A blows when the switch is closed. If an 80 V supply is supplying power to the circuit, what would be the maximum possible value of the resistance for which the current flows through the circuit?

100 ohms

The fuse is rated at 0.8 A which means that the current will continue flowing through the circuit when the current is limited to 0.8 A. According to ohm's law, \(I = \frac{\mathrm{V} }{\mathrm{R} } \) . First option will give I=80/100=0.8 A which is the rated voltage and the current will flow through the circuit. For second, third and fourth options, currents are I=80/90=0.89, I=80/80=1 A and I=80/70=1.14 A which are greater than the rated current.

Which of the following is the correct definition of an electrical cell?

A device that is capable of changing some form of energy (such as chemical energy) into electricity.

An electrical cell supplies electrical current. Examples include batteries and solar cells.

Current flows ____

Both options "From Higher Potential to Low Potential" and "Towards least resistance"

Current is the flow of charges from higher potential to lower potential and current always takes the path of least resistance.

What is the frequency of Direct Current (DC)?

0 Hz

Frequency is the number of occurrences of an event per unit time and can be expressed as Hz. In DC, the charges flow steadily in one direction while charges keep switching directions in AC. Since no switching (events) occur with DC, the frequency is zero.

An inductor stores energy in the form of ____.

Magnetic field

When a current is flowing through an inductor, an energy is stored in the form of magnetic field. The formula of energy stored in an inductor is: Energy \(E= \frac{\mathrm{1} }{\mathrm{2} }L I^2\).

What is the reading on the kilowatt-hour meter shown below?

5692

The meter has four dials with the numbers 0 to 9. The pointers rotate in different directions. Read the dials from the left, using the number the dial pointer just passed.

A circuit contains three parallel resistors. Each resistor has 3 amps flowing through them. What is the total current flowing through the circuit?

9 A

For resistors in parallel, the total current is equal to the sum of the currents through each resistor.

The generated force on a current carrying wire can be increased by ____

Increasing the amount of current flowing.

The generated force on a current carrying wire is directly proportional to the amount of current flowing, the length of the wire, and the strength of the magnetic field. Increasing any of these will increase the force on the wire and the capacity to do work.

Copper is a good conductor of electricity because ____.

It demonstrates a low amount of resistance.

Flow of electrons (electric current) is inversely proportional to the resistance. The material exhibiting the least resistance will be a good conductor of electricity. That is why copper is a good conductor of electricity.

The amount of energy used by a consumer in their home or business is typically measured in

kilowatt-hours

A kilowatt-hour (kWh) is a unit of energy equivalent to one kilowatt (1 kW) of power expended for one hour

Electric power can be measured by what type of instrument?

Wattmeter

Since electrical power is measured in watts, you can measure watts with a watt meter.

Printed circuit boards are typically made out of

fiberglass

Fiberglass is used to make most printed circuit boards.

The measurement "mil" refers to _______.

one thousandth of an inch

'A "mil" (from milli) refers to one thousandth.