Question

Ohm's Law is given by the equation V = IR where V is voltage in watts, I is current in amperes, and R is resistance in Ohms. A certain vacuum cleaner needs 8 amperes. Which equation can be used to determine the voltage for a given amount of resistance?

1. V= 8/R
2. V=0.8R
3. V=8R
V=R/8

Answer 1

3 ------------------------------------------------------------------------------------------------

Answer 2

V = 8 R

Explanation:

The Ohm's law gives the relationship between the voltage, current and the resistance of the circuit. The mathematical relation is given by :

V = I R........(1)

I is current in amperes

R is resistance in ohms

V is voltage in volts

Current needed by the vacuum cleaner, I = 8 A

Put the value of I in equation (1) as :

`V=8* R`

or

V = 8 R

So, the correct equation that is used to determine the voltage for a given amount of resistance is (c).