A camcorder has a power rating of 12 watts. If the output voltage from its battery is 3 volts, what current does it use?

The current in a hair dryer measures 13 amps. The resistance of the hair dryer is 9 ohms. What is the voltage?

Which of the following statements about Ohm's Law is true?

A. To increase the current, decrease the resistance.

B. Ohm's law relates power, current and resistance.

C. Increasing the voltage decreases current if resistance stays the same.

D. Keeping the same voltage and decreasing resistance decreases the current.

A 1.5m wire carries a 7 A current when a potential difference of 53 V is applied. What is the resistance of the wire?

Question

24 June, 13:58

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Answers (1)

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Dean Bright · Answer 1

For the camcorder P = V x I

So I = P/V

for the hair dryer V = I x R

for multiple choice A

for the wire R = V/I