Question

1. A camcorder has a power rating of 19 watts. If the output voltage from its battery is 7 volts, what current does it use?

________ answer _________ Units

2. A 1.5m wire carries a 6 A current when a potential difference of 57 V is applied. What is the resistance of the wire?

Your Answer: _______ Units _______

3. A clothes dryer uses about 2 amps of current from a 240 volt line. How much power does it use?

Your Answer: ------------- Units __________

4.

Answer 1

1.p=VI
p=power(watt)
V=volt
I=current
p=19
V=7
I=?
I=p/v
I=19/7
I=2.71 Ampere

2.V=IR
R=V/I
R=?
V=57
I=6
R=57/6
R=9.5ohm

3.P=IV
p=?
I=2
V=240
p=240x2
p=480watt