Question

An alarm clock has a current of 4.5 amps and a resistance of 3.2 ohms. What is the voltage in the circuit? A. 1.4 volts B. 0.71 volts C. 14 volts D. 46 volts

Answer 1

C

Step-by-step explanation:

4.5*3.2=14.4

Answer 2

14.4 V

Step-by-step explanation:

Concept being tested: Current and electricity-Ohm's law

To answer this question we need to know the Ohm's law

• According to ohm's law, the potential difference through a conductor and the current are inversely proportional when other factors are kept constant.
• That is,
  `V\alpha I`
• Mathematically,
  `V=IR` (R is a constant, resistance of a conductor)

In this case;

Current, I = 4.5 Amps

Resistance, R = 3.2 ohms

We are required to calculate the voltage.

But;

V=IR

= (4.5 Amps × 3.2 ohms)

= 14.4 V

Therefore, the voltage in the circuit is 14.4 V