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Q1. In the circuit below the battery has negligible internal resistance. A P 30Ω Q 6V 30Ω R 30Ω S a) What is the p.d. between i) P and S?…………………… ii)P and Q?…………………… iii)S and Q?………………….. b) What is the current through each of the resistors? ………………………………………………………… ………………………………………………………… ………………………………………………………… c) What is the current through the ammeter? ………………………………………………………… ………………………………………………………… ………………………………………………………… Q2. On the axes below draw the graph for a lamp. I V 0 Q3. On the axes below draw the graph for a diode. I V 0 Q4. A cell is connected across a conductor. The current flowing in the conductor is 80mA i) Calculate the charge that flows past a point in the conductor in 2 minutes ………………………………………………………… ………………………………………………………… ii)Calculate the number of electron charge carriers passing the same point in this time. ………………………………………………………… ………………………………………………………… iii) If 17.2 J of energy is transferred to the conductor in this time, find the p.d. across the conductor. ………………………………………………………… ………………………………………………………… Q5. The circuit below is used to find the internal resistance and emf of a dry cell. V ∈ r R A Use the readings on the next slide to find the values of emf and internal resistance.( Hint: Draw a straight line graph of V(y axis) against I (on x axis)). Reading on Voltmeter/V 2.0 Reading on ammeter/A 0.03 1.5 0.07 1.0 0.10 0.5 0.14 Q6.In the potential divider circuit below assume that the internal resistance of the cell is negligible and the resistance of the voltmeter is infinite. 12V 10Ω 20Ω V a) What is the voltmeter reading? ………………………………………………………… ………………………………………………………… b)The 10Ω resistor is replaced by a 60Ω resistor. Calculate the p.d. across the 60Ω resistor ………………………………………………………… ………………………………………………………… c) Explain why the voltmeter reading across the 20Ω resistor has changed. ………………………………………………………… ………………………………………………………… ………………………………………………………… ………………………………………………………… d) A 90Ω resistor is now placed in parallel with the 20Ω. Explain what will happen to the voltmeter reading without further calculation. ………………………………………………………… ………………………………………………………… ………………………………………………………… ………………………………………………………… Q7. a)Define resistivity …………………………………………………………………… …………………………………………………………………… …………………………………………………………………… …………………………………………………………. b) Calculate the resistance of 30cm of copper wire which has a diameter of 2mm. The resistivity of copper is1.6x10-8Ωm. …………………………………………………………………… …………………………………………………………………… …………………………………………………………………… …………………………………………………………………… Q8.a) A light bulb of resistance 1200Ω is powered by a 240v supply. Calculate the following: i) The current flowing through the bulb. ………………………………………………………… ………………………………………………………… ………………………………………………………… ii) The amount of charge which passes through the bulb in 5 minutes. ………………………………………………………… ………………………………………………………… ………………………………………………………… iii) The energy dissipated by the bulb in 5 minutes. ………………………………………………………… ………………………………………………………… …………………………………………………………
