Ohm's+Law+Answers

1) A light bulb with a resistance of 2 ohms is connected to a 1.5 volt battery as shown. Calculate the current that will flow.

V = 1.5 V R = 2 ohms I = ?

I= V/R

I = 1.5 V/2 ohms = 0.75 A


 * The answer is 0.75 A.**

2) A light bulb requires 3 amps to produce light. The resistance of the bulb is 1.5 ohms. How many batteries do you need if each battery is 1.5 volts?

I = 3 A R = 1.5 ohms V = ?

I = V/R so V = IR

V = 3 A x 1.5 ohms = 4.5 V

4.5 V/1.5 V = 3


 * The answer is that 3 batteries are needed.**