Question

4. To determine the resistance R of a resistor ,an ammeter and voltmeter can be used.
a) Draw a circuit diagram to show how you would use these instruments, together with a variable power supply to determine R. If the voltmeter gave a reading of 6.5 V and the ammeter gave a reading of 1.25 A , what would be the value of R?

Answer 1

i will answer your questions

Answer 2

Value of resistance is $5.2$Ω.

Explanation:

Given:

Voltage reading $=6.5 V$

Current reading $=1.25 A$

To find: Value of resistance R

Calculation:

From Ohm's Law:

$V=IR$

$6.5=1.25*R\\R=\frac{6.5}{1.25} \\R=5.2$

Therefore, value of resistance $R=5.2$Ω

Picture below shows an electrical circuit with:

• Voltmeter connected in parallel with the resistor.
• Ammeter connected in series with the resistor.
• A variable AC voltage source connected in the circuit.

Answer:

Value of resistance $R=5.2$Ω