Question

How much power is produced by a flashlight that has a voltage of 12 volts and a current of 6.5 × 10-2 amps?
0.78 watts
78 watts
190 watts
0.0054 watts
1.9 watts

Answer 1

Use the formula:
P = V times I
\[P=12\times6.5\times10^{-2}=you\ can\ calculate\]

Answer 2

i already figured it out thanks tho, can you possibly help me with my next question?

Fuel cells have been developed that can generate a large amount of energy. For example, a hydrogen fuel cell works by combining hydrogen and oxygen gas to produce water and electrical energy. If a fuel cell can generate 10.0 kilowatts of power and the current is 15.8 amps, what is the voltage of the electricity?
0.63 volts
158volts
633 volts
158,000 volts
5.8 volts

Answer 3

Just rearrange the formula that I gave you to find voltage in terms of power and current:
\[V=\frac{P}{I}\]