Three resistors of 10 Ω, 15 Ω and 20 Ω are connected in series in a circuit. If the potential drop across the 15 Ω resistor is 3 V, find the current in the circuit and potential drop across the 10 Ω resistor.
According to ohm’s law,
- V is potential difference.
- I is current.
- R is resistance.
Current through 15 ohm resistor with potential difference 3 V,
I = V / R
= 3 / 15
= 0.2 A
In a series circuit, the same current flows through the entire circuit.
Therefore, current in the circuit = 0.2 A
Potential drop across the 10 ohm resistor,
V = I*R
= 0.2 A * 10 ohm
= 2 V