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

V = 8 R  

Step-by-step 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 :

or

V = 8 R

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

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