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Electricity 2 Where needed take the charge on the electron to be –1.6x10-19 C 1. If the current through the ammeter in the first circuit (Ao) with one cell and one bulb is 0.2 A calculate the expected currents in all the other ammeters assuming that all the cells and bulbs are identical. Ao A1 2 1 A6 A5 A7 4 3 8 5 A8 9 7 A4 A3 A2 10 A9 11 A10 12 A12 A13 A11 13 Questions: 2. What will be the reading on ammeter 6 if bulb 8 blows? 3. What will be the reading on ammeter 7 if bulb 8 blows? 4. What will be the reading on ammeter 9 if bulb 10 blows? 5. What will be the reading on ammeter 10 if bulb 12 blows? 14 6 6. What will be the reading on ammeter 11 if bulb 13 blows? 7. If a current of 25 mA flows in a wire how many electrons pass that point per second? Charge on one electron = -1.6x10-19 C 8. Define: (a) resistance (b) resistivity 9. Draw a graph to show how the current varies with the voltage for: (a) a metal filament in a light bulb (b) a semiconductor 10. Calculate: (a) the current that flows in a resistor of 200 when connected to a voltage of 240 V (b) the current that flows in a resistor of 50 when connected to a voltage of 30 V (c) the voltage across a 400 resistor when a current of 20 mA flow through it (d) the resistance of a 25 cm long metal wire that has a resistivity of 2.5x10-8 m and a diameter of 0.2 mm .