A 1.5m wire carries a 9 A current when a potential difference of 89 V is applied. What is the resistance of the wire?
The current in a hair dryer measures 10 amps. The resistance of the hair dryer is 8 ohms. What is the voltage?
A camcorder has a power rating of 16 watts. If the output voltage from its battery is 4 volts, what current does it use?
3 answers
1. P = V*I.
16 = 4*I,
I = ?
3. V = I*R.
16 = 4*I,
I = ?
3. V = I*R.
2. R = V/I = 89/9.