Question

How much current does a 310 W device draw when given a voltage of 120 V?

- 3.6•10^4 A

- 4.0•10^-2 A

- 4.2•10^2 A

- 2.6•10^0 A

Answer 1

`2.6* 10^(0)`

Step-by-step explanation:

Power is expressed as rhe product of voltage and current hence P=IV where V is voltage across the circuit, I is current and P is power. Making current the subject of rhe formula then

`I=\frac {P}{V}`

Substituting 310 W for power and 120 V for voltage then

`I=\frac {310}{120}=2.58333333333A\approx 2.6A`

Giving the answer in scientific notation, then current is
`2.6* 10^(0)`