Question

#1

A 1.5m wire carries a 7 A current when a potential difference of 99 V is applied. What is the resistance of the wire?

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#2

A clothes dryer uses about 7 amps of current from a 240 volt line. How much power does it use?

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Answer 1

1.) Using Ohm's law, we know V=IR, so we do not need to know how long the wire is. Given the potential difference is 99 and current is 7A, we can solve for resistance.

(99V)/(7A) = 14.14285714Ω

2.) Power is P=IV, thus (240)(7) = 1680W