Question

Describe how a student would use the circuit below to take readings necessary to determine the resistance of resistor R (6 marks)

Answer 1

Answer:

switch on the circuit

read both the ammeter and voltmeter

adjust the variable resistor to change the current

take new readings from the ammeter and voltmeter

draw a voltage-current graph

use the equation: resistance = voltage ÷ current

Explanation:

thats the answer ^

Answer 2

Answer:

The student determines the resistance of resistor R by the use of ohm's law.

Explanation:

As shown in the figure,

The ammeter is connected in series with the resistor R and the voltmeter is connected in parallel to the resistor R.

Here,

The resistance of the resistor is denoted by R.

Let the value of current that passes through the resistor as shown by the ammeter be I.

Let the value of voltage across the resistor as shown by the voltmeter be V.

Now,

By the ohm's law,

$R=\frac{V}{I}$

So, the resistance of resistor R is determined by the use of ohm's law.