Question

How much electrical power consumption results from measured values of 10 Volts and 2 Amps?

Answer 1

`20\; {\rm W}`.

Step-by-step explanation:

The electric power that an appliance consumes is equal to the product of:

• the voltage across the appliance, and
• the current going through the appliance.

In other words:

`(\text{power}) = (\text{voltage})\, (\text{current})`.

When voltage is measured in volts and current is measured in amperes, the resultant unit of power would be watts.

In this question, it is given that
`(\text{voltage}) = 10\; {\rm V}` and
`(\text{current}) = 2\; {\rm A}`. Therefore, the power that this appliance consumes would be:

`\begin{aligned} (\text{power}) &= (\text{voltage})\, (\text{current}) \\ &= (10\; {\rm V})\, (2\, {\rm A}) \\ &= 20\; {\rm W} \end{aligned}`.