Question

The formula for electrical power (P, in watts) is where V is the voltage in volts and R is the resistance in ohms. For a particular brand of water heater, R is 32 ohms and P is 0.5 watts. The formula to find V is , and the voltage at which the heater operates is volts.

Answer 1

Answer: 4 V

Explanation:

The formula for electrical power
`P` is:

`P=(V^(2))/(R)`

Where:

`P=0.5 W` is the water heater electrical power

`V` is he water heater voltage

`R=32 \Omega` is the electrical resistance

Isolating
`V`:

`V=√(PR)`

`V=√((0.5 W)(32 \Omega))`

Hence:

`V=4 V`