A 1 ohm is a unit of electrical resistance. In simple terms, it measures how much a material or component resists the flow of electric current.
If you have a resistor with a resistance of 1 ohm, it means that the resistor will oppose the flow of current in a circuit, but only a small amount (compared to higher values like 10 ohms or 100 ohms).
Ohm's law, which relates voltage (V), current (I), and resistance (R), is often written as:
\[
V = I \times R
\]
So, if you have 1 ohm of resistance and you apply 1 volt across it, the current that flows through the resistor will be 1 ampere (since \( I = \frac{V}{R} = \frac{1 \text{ volt}}{1 \text{ ohm}} = 1 \text{ ampere} \)).
In summary, 1 ohm represents a resistance that allows 1 ampere of current to flow when a 1-volt potential is applied across it.