If a potentiometer wire has a resistance of 10 ohms and a current of 0.5 A flows
Practice Questions
Q1
If a potentiometer wire has a resistance of 10 ohms and a current of 0.5 A flows through it, what is the potential difference across the wire?
2.5 V
5 V
10 V
15 V
Questions & Step-by-Step Solutions
If a potentiometer wire has a resistance of 10 ohms and a current of 0.5 A flows through it, what is the potential difference across the wire?
Correct Answer: 5 V
Step 1: Identify the values given in the problem. The resistance (R) of the potentiometer wire is 10 ohms, and the current (I) flowing through it is 0.5 A.
Step 2: Recall Ohm's law, which states that the potential difference (V) across a conductor is equal to the current (I) flowing through it multiplied by the resistance (R) of the conductor. The formula is V = I * R.
Step 3: Substitute the values into the formula. Here, I = 0.5 A and R = 10 ohms.
Step 4: Calculate the potential difference. Multiply 0.5 A by 10 ohms: 0.5 * 10 = 5.
Step 5: Conclude that the potential difference (V) across the wire is 5 volts.
Ohm's Law – Ohm's Law states that the potential difference (V) across a conductor is directly proportional to the current (I) flowing through it, with the resistance (R) being the constant of proportionality, expressed as V = IR.
