### ZIMSEC O Level Combined Science Notes: Experiment: Ohm’s Law

- It gives the relationship between potential difference and current through a wire in a circuit
- According to the law:
- \text{potential difference}\propto\text{current}
*The current passing through a wire is proportional to the potential difference across its ends**Provided the temperature remains constant*- An equation can thus be formed:
- constant\dfrac{\text{potential difference(V)}}{\text{current (I)}}
is the constant*Resistance-*- It is a measure of how difficult it is for a current to flow through the given wire
- It is measured in ohms
- The symbol Ω is used to represent ohms
- Ohms law can be expressed as:
- \text{R =}\dfrac{V}{I}
- V is voltage
- I is current
- R resistance
- By substituting the formula the equation can be used to find unknown variables where two of the variables are known

To access more topics go to the Combined Science Notes page.