H Exp – Electricity and Electronics 04 – Internal resistance of a cell

Aim – To determine the internal resistance of a cell.

Instructions

▪ Measure the e.m.f. of the cell
▪ Click on the red buttoned switch to close the switch. The variable resistor is set at its largest resistance.
▪ Record the readings on the ammeter and voltmeter.
▪ Click on the variable resistor to decrease its resistance.
▪ Take a range of readings.
▪ For each pair of readings determine the lost volts.
▪ Use an appropriate format to determine the internal resistance of the cell.

▪ Wait for Player to load. Best viewed full screen, right-click or on mobile, press and hold and select Enter full screen. Full screen not available on iOS.