# Question #dfcf3

Dec 14, 2017

An object that allows 1 Amp of current to flow through it, when the potential difference across it is 1 Volt, has a resistance of 1 Ohm.

#### Explanation:

The Ohm is a measure of resistance. The word "$\text{resistance}$" refers to the fact that the object "$\text{resists}$" the flow of current through it. The current that is forced through the object by the voltage across it is given by Ohm's Law:
$I = \frac{V}{R}$
This says that if the object's resistance is doubled, then the voltage has to be doubled if the desire is to force the same current $I$ to flow through the object.

Therefore:
An object that allows 1 Amp of current to flow through it, when the potential difference across it is 1 Volt, has a resistance of 1 Ohm.
Or, an object that allows 10 Amps of current to flow through it, when the potential difference across it is 20 Volts, has a resistance of 2 Ohms.

I hope this helps,
Steve