Question

You are required to determine the resistance per unit length of a nichrome wire p, you are provided with a d.c power supply an ammeter and voltmeter.

describe how you would use the circuit to determine the resistance per unit length​

Answer 1

See below

Step-by-step explanation:

1. Measure and record the length of the nichrome wire (in cm)

2. Measure and record the voltage of the DC power supply with the voltmeter (in volts).

3. Assemble a circuit:

• Connect one end of the niochrome wire to a DC power supply terminal.
• Connect the other end of the nichrome wire to a terminal on the ammeter.
• Connect the other ammeter terminal to the other battery electrode.

4, Measure and record the current (in amps).

Use the equation V = IR, where V is volts, I is amps, and R is the resistance, in ohms. Solve for R (R = V/I)

5. Divide the value of R by the length on the nichrome wire. This will produce a number with units of ohms/cm, the desired "resistance per unit length​."