If a circuit has a 15V source and a total resistance of 3Ω, what is the total po
Practice Questions
Q1
If a circuit has a 15V source and a total resistance of 3Ω, what is the total power consumed in the circuit?
45W
75W
25W
15W
Questions & Step-by-Step Solutions
If a circuit has a 15V source and a total resistance of 3Ω, what is the total power consumed in the circuit?
Step 1: Identify the voltage (V) in the circuit, which is given as 15V.
Step 2: Identify the total resistance (R) in the circuit, which is given as 3Ω.
Step 3: Use the formula for power (P) in a circuit, which is P = V^2 / R.
Step 4: Substitute the values into the formula: P = 15^2 / 3.
Step 5: Calculate 15^2, which equals 225.
Step 6: Divide 225 by 3 to find the power: 225 / 3 = 75.
Step 7: Conclude that the total power consumed in the circuit is 75W.
Ohm's Law – The relationship between voltage (V), current (I), and resistance (R) in an electrical circuit, which is fundamental for calculating power.
Power Calculation – Understanding how to calculate power using the formula P = V^2 / R, which is derived from Ohm's Law.
