EXAMPLE #1

The current in a circuit is 0.05 amps. The total resistance is 2000 ohms. What is the voltage drop across the circuit?

SOLUTION

V = ?

I = 0.05 amps

R = 2000 ohms

V = I x R

= 0.05 amps x 2000 ohms

= 100 volts

Therefore, the voltage drop is 100 volts.

EXAMPLE #2

A 12 volt battery is connected to a 300 ohm resistor. What current travels through the circuit?

SOLUTION

V = 12 volts

I = ?

R = 300 ohms

V = I x R

12 volts = I x 300 ohms

12 volts / 300 ohms = I

0.04 amps = I

There, the current is 0.04 amps or 40 milliamps.