unit 7 -- light and power

Multiple Choice

The rate at which electric energy is delivered by the battery.

• current power

• electric power

• radiant power

• kinetic power

Multiple Choice

According to this equation, power is the rate ----

• electric energy produces light

• electric energy is stored in a battery

• electric energy is generated by a battery

Multiple Choice

The symbol for voltage in an equation is __.

• V

• amps

• P

• E

Multiple Choice

Electric power depends on voltage and ____.

• wires

• current

• magnetism

• fuel

Multiple Choice

Electrical power is greater if --

• the voltage across the circuit is lower

• the voltage across the circuit is higher

• the current decreases

Multiple Choice

Current is measured in ---

• watts

• volts

• amps

• juoles

Multiple Choice

If a lightbulb is connected to a 9 V battery and draws 0.55 A of current, how much power does it use?

• 5 watts

• 16.36 watts

• 16.36 amps

Multiple Choice

A portable spotlight device draws 1.5 amps of current from a 6.0 volt battery.  What is the power of the spotlight?

• 4 amps

• 4 watts

• 9 watts

• 9 juoles

Multiple Choice

When comparing the efficiency of different types of electric bulbs, what happens to the wasted energy?

• released as heat energy

• excess current in the wires

• too much light

• bulbs break easier