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Exam 7: Electricity

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Question 1

Multiple Choice

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A light bulb used in a slide projector draws a current of 6 amperes when operating on 120 volts. If two slide projectors are connected in parallel across the same 120-volt source, the current drawn from the source in amperes is

A) 3.
B) 6.
C) 9.
D) 12.
E) none of the above.

F) B) and D)
G) A) and B)

Correct Answer

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D

Question 2

True/False

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An electrostatic precipitator uses an electric field to remove smoke from the air.

A) True
B) False

Correct Answer

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True

Question 3

Multiple Choice

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If the temperature of a wire increases, its resistance

An atom with fewer electrons than protons is a negative ion.

A heater is rated at 1200 watts for a 120-volt source. The resistance in ohms of the heater is

A heater is rated at 1200 watts for a 120-volt source. If two heaters are connected in parallel across the 120-volt source, the total power drawn from the source increases to 2400 watts.

If the temperature of a wire increases, its resistance __________.

An electric toaster operating on 120 volts draws a current of 9 amperes. What is the resistance of the toaster?

A light bulb used in a slide projector draws a current of 6 amperes when operating on 120 volts. If two slide projectors are connected in parallel across the same 120-volt source, the current drawn from the source is __________.

What is the usual symbol used to represent an amount of charge?

Two charged bodies separated by a distance d exert an electrical force on each other. The distance d is doubled. The electrical force on each body is now 1/2 of the original force.

Fuses and circuit breakers are used to prevent

If the diameter of a wire increases, its resistance __________.

The electric field shown is produced by a single point charge at the center of the picture. What type of charge produces the electric field shown?

Voltage is a measure of the energy per unit charge supplied by a battery.

A light bulb used in a slide projector draws a current of 6 amperes when operating on 120 volts. If two slide projectors are connected in series across the same 120-volt source, the current drawn from the source is __________.

The electric field shown is produced by a single point charge at the center of the picture. If a new negative point charge is placed at location B directly above the one pictured, the force on it will

A simple electrical circuit has a constant voltage power supply and a variable resistor as a circuit. As you increase the resistance the current flow _______________.

The resistance of a conducting material depends on its

The energy used by a 100-watt light bulb in 1 hour is