Question

An electrical device draws 4.68 A at 220 V. (a) If the voltage drops by 31%, what will be the current, assuming the resistance doesn't change?

Answer 1

The current will be 3.23 A.

Step-by-step explanation:

Given that,

Current I = 4.68 A

Voltage V = 220 volt

We need to calculate the resistance

Using ohm's law

`V = I R`

`R = (V)/(I)`

Where,

V = voltage

I = current

R = resistance

Put the value into the formula

`R = (220)/(4.68)`

`R = 47\ \Omega`

We need to calculate the current

If the voltage drops by 31%

Voltage will be

`V'=V-V*31%`

`V'=220-220*(31)/(100)`

`V'=151.8\ volt`

Now, the current will be

`I = (151.8)/(47)`

`I=3.23\ A`

Hence, The current will be 3.23 A.