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Essential Calculations in Magnetism and Electricity for Physics S3

This comprehensive guide covers key calculations in magnetism and electricity, suitable for S3 Physics students. It includes problems and solutions related to current flow, voltage measurement, energy transfer, power consumption, resistance in series and parallel circuits, and Ohm's Law. Each question is designed to deepen understanding of fundamental concepts and improve mathematical problem-solving skills in the context of electrical systems. Use this resource to solidify your grasp of electricity-related calculations and boost your exam readiness.

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Essential Calculations in Magnetism and Electricity for Physics S3

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  1. Magnetism and Electricity (III) (Calculations) S3 Physics - 1 2 3 4 5 6 7 10 11 12 13 14 8 9 15 16 17

  2. answer • What is the current flowing in a circuit if 30C are passed in 1 minute? Q = It 30 = I x 60 I = 30/60 0.5A

  3. answer 2. What voltage would be measured over a 100 Ω resistor when 10mA flows through it? V = IR V = 0.01 x 100 1V

  4. answer 3. How many joules of energy are transferred by a 60W bulb every second? P = E/t 60 = E/1 E =60/1 60J

  5. answer 4. Calculate the size of the current flowing in a 3kW mains operated appliance. 13A

  6. answer 5. A television draws 0.1 A and has a resistance of 5000Ω. Calculate the power consumption P = IV P = 0.1 x 5000 50W

  7. answer 6. How many 1.5V bulbs operating at their correct voltage could be connected in series with a 6V cell? Vs = V1+ V2… 6 = 1.5 +1.5 + 1.5 +1.5 6 = 4(1.5) Four bulbs

  8. answer 7. What is the total resistance of a set of Christmas lights comprising of 30 individual 10Ω lamps in series? Rt = R1+R2+… Rt= 30(10) 3600 Ω or 3.6kΩ

  9. answer 8. An electrical supply for a caravan delivers a total current of 2A to the fridge and lighting circuits. If the lights use 0.25A, what is the operating current of the fridge? It = Ilights+Ifridge 2= 0.25 + Ifridge I fridge = 2 - 0.25 1.75A

  10. answer 9.What is the total resistance of three 90Ω resistors connected in parallel? 1/Rt = 1/R1+1/R2+1/R3 1/Rt = 1/90+1/90+1/90 1/Rt = 3/90 Rt = 90/3 30 Ω

  11. answer Work out the enegy used in kWhr for a 2000 W electric heater which is used for 45 mins? E = Pt E= 2(kW)x 0.75(hr) 1.5kWhr

  12. answer 11. How many joules are used if a tumble dryer uses 0.75 kWh? 750Whr 750J/s(hr) 750x3600 2700kJ or 2700000J

  13. answer 12. Select the appropriate formula from your data book.. That shows the relationship between charge, current and time. Q=It

  14. answer 13. Select the appropriate formula from your data book.. That shows the relationship between voltage, current and resistance. V = IR

  15. answer 14. State Ohm’s Law. V = IR

  16. answer Select the appropriate formula from your data book.. To calculate resistances in series. 15. Rt = R1+R2+R3

  17. answer Select the appropriate formula from your data book.. For combining resistors in parallel. 16. 1/Rt= 1/R1 +1/R2 + 1/R3

  18. answer 17. State the relationship between Energy and Power P = E/t

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