A circuit consists of a battery with an electromotive force (emf) of 12 V connected to a resistor of 4 Ω. The current flowing through the circuit is measured as 3 amps.
Determine the voltage drop across the resistor.
### Solution:
According to Ohm's Law, the relationship between voltage (V), current (I), and resistance (R) in a circuit is given by:
V = I * R
We are given:
emf (E) = 12 V
Resistance (R) = 4 Ω
Current (I) = 3 A
Substituting the given values into the formula:
V = I * R
V = 3 A * 4 Ω
V = 12 V
Therefore, the voltage drop across the resistor is 12 V.
This question tests the understanding of Ohm's Law and how to calculate the voltage drop across a resistor given the current flowing through it and its resistance.