Question

When the potential difference across a lamp is 3.3V the current is 0.15 calculate the resistance of the lamp and give the unit

Answer 1

Answer:

22Ω

Explanation:

Given parameters:

Potential difference  = 3.3V

Current  = 0.15A

Unknown:

Resistance  = ?

Solution:

According to ohm's law, potential difference, current and resistance are related by the expression below;

             V = I R

where V is the voltage

           I is the current

          R is the resistance

          3.3 = 0.15 x R

             R = $\frac{3.3}{0.15}$   = 22Ω