Draw the circuit that could be used to investigate how the current through a filament lamp affects its resistance. How could it be used to investigate this? (6 marks)
*Circuit diagram showing a battery, filament lamp, ammeter and variable resistor connected in series, with a voltmeter connected in parallel with the filament lamp.*The resistance of the variable resistor should be altered to change the values of the current flowing through the lamp. For different values of the resistance of the variable resistor, the current flowing through the lamp should be measured with the ammeter and the voltage across the lamp should be measured with the voltmeter. The resistance of the lamp can be calculated using the equation R = V / I. The resistance of the lamp should be calculated for a wide enough range of different currents that would allow for a valid conclusion to be made, perhaps by plotting the current and resistance values on a graph and drawing a line of best fit.
Related Physics GCSE answers
All answers ▸State Newton's 1st Law:
It takes 4200 Joules to heat up 1 kg of water by 1 C^o. If you have a kettle with a power of 2500 Watts, how long will it takes to boil 0.8 kg of water from an initial temperature of 25 C^o to the nearest second??
A jug containing 0.250 kg of liquid is put into a refrigerator. Its temperature decreased from 20°C to 15°C. The amount of energy transferred from the liquid was 5,250 J. Calculate the specific heat capacity of the liquid.
When a toothbrush is charging, p.d. across the primary coil is 230 V, p.d. across the secondary coil is 7.2 V. The primary coil in the charging base has 575 turns of wire on its coil. Find the number of turns on the secondary coil inside the toothbrush.