Determination of equivalent resistance of two resistors when connected in parallel

Aim

When two or more resistors are connected together between two points then they are said to be connected in parallel.

In parallel combination,

The formula to calculate equivalent resistance in series is: 1/R_p = 1/R₁ + 1/R₂ + 1/R₃

Setup the devices as shown in the circuit diagram (i).
Plug the key and adjust the rheostat by sliding its variable terminal till the ammeter and the voltmeter show a reading.
Note the readings of voltmeter and ammeter. Take out the plug or switch off the battery eliminator for a moment.
Repeat the steps 2 and 3 for the different values of current by varying the sliding terminal of rheostat.
Calculate resistance R₁ using formula R = V/I.
Similarly, calculate R₂ and R_p (equivalent resistance in parallel) by following above steps.

Mean value of R₁ = (2+2+2)/3 = 2 Ω

Mean value of R₂ = (1+1+1)/3 = 1 Ω

Mean value of R_p = (⅔+⅔+⅔)/3 = ⅔ Ω = 0.67 Ω

$\frac{1}{R_{p}}$ = $\frac{1}{R_{1}}$ + $\frac{1}{R_{2}}$ = $\frac{1}{2}$ + $\frac{1}{1}$ = $\frac{3}{2}$

Or, R_{p = Ω}

Thick copper wires should be used as connecting wires and using sandpaper, their insulation should be removed.
The connections should be tight.
Voltmeter should be connected in parallel with the resistor.
To avoid unnecessary heating in the circuit, the current should be passed for a short time.