20.3 Electric Circuits

A number of light bulbs are connected to an energy source in a series circuit. What will happen to the other bulbs if one of the bulbs burns out?

• They will be brighter.

• They will be dimmer.

• They will turn off.

• Nothing will happen.

A pair of 15-watt computer speakers are connected to a 12-volt power supply. What is the electric current running through the speakers?

• 0.8 A

• 1.25 A

• 12.5 A

• 180 A

A ground-fault circuit interrupter is a switch that opens to prevent overheating when the current in a circuit is too high.

• True

• False

A ground-fault circuit interrupter shuts down a circuit if it

• melts

• senses an overload.

• senses unequal currents.

• senses moisture.

If you know the power rating of an appliance and the

voltage of the line it is attached to, you can calculate the

current the appliance uses by

• multiplying the voltage by the power.

• subtracting the power from the voltage.

• dividing the voltage by the power.

• dividing the power by the voltage.

Most of the circuits in your home are

• series circuits

• parallel circuits.

• reversible circuits.

• closed circuits.

How many paths through which charge can flow would be shown in a circuit diagram of a series circuit?

• one

• two

• none

• an unlimited number

What is the unit of electric power?

• ampere

• volt

• watt

• ohm

Which of the following provides electrical safety?

• circuit breaker

• fuse

• ground-fault circuit interrupter

• all of these

If you replace the paper clip with a plastic spoon, what happens?

• The bulb doesn't light
• The bulb is dimmer
• The wires get hot
• There is no change