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Question-1. How is energy transferred by electrical working?

Answer-1: It flows in an electrical circuit

Question-2. What is electrical current?

Answer-2: The rate of flow of electrical charge

Question-3. In most circuits, what is the charge that flows to carry the current?

Answer-3: Electrons

Question-4. What is needed for electrical charge to flow through a closed circuit?

Answer-4: A source of potential difference.

Question-5. What is a circuit diagram?

Answer-5: Simplified circuit drawings using symbols

Question-6. What is a series circuit?

Answer-6: A circuit where all of the components are connected in one loop.

Question-7. What is the parallel circuit?

Answer-7: A circuit where there is more than one loop of components.

Question-8. What can you say about the current anywhere in a series circuit?

Answer-8: It stays the same

Question-9. What happens to the current in a parallel circuit?

Answer-9: It is shared between the branches but the total stays the same

Question-10. What happens if there is a break in a series circuit?

Answer-10: The current stops flowing

Question-11. What happens if there is a break in one branch of a parallel circuit?

Answer-11: The current stops in that branch only

Question-12. What is the word equation for flow of charge?

Answer-12: charge flow = current x time

Question-13. What is the symbol equation for flow of charge?

Answer-13: Q = I t

Question-14. What is the unit and unit symbol of charge?

Answer-14: Coulombs, C

Question-15. What is the unit and unit symbol of current?

Answer-15: Amps, A

Question-16. What piece of equipment is used to measure current?

Answer-16: Ammeter

Question-17. How are ammeters arranged in a circuit?

Answer-17: In series

Question-18. What is the direction of conventional current?

Answer-18: Positive to negative

Question-19. What is another name for potential difference?

Answer-19: Voltage

Question-20. What is potential difference?

Answer-20: The amount of energy lost or gained by one unit of charge

Question-21. What is the unit and unit symbol of potential difference?

Answer-21: Volts, V

Question-22. What piece of equipment is used to measure potential difference?

Answer-22: Voltmeter

Question-23. How are voltmeters arranged in a circuit to measure the potential difference?

Answer-23: In parallel to the component you are measuring

Question-24. What happens to the potential difference in series circuit?

Answer-24: It is shared between the components

Question-25. What should all of the potential differences add up to in a series circuit?

Answer-25: The potential difference of the battery

Question-26. What happens to the potential difference in a parallel circuit?

Answer-26: The total potential difference across each branch is the same as the potential difference from the battery

Question-27. What equation links potential difference, current & resistance?

Answer-27: Potential difference = Current x Resistance

Question-28. What is the symbol equation for potential difference?

Answer-28: V = I R

Question-29. What is resistance?

Answer-29: Anything in a circuit that slows down the flow of current

Question-30. What is the unit and unit symbol of resistance?

Answer-30: Ohms, Ω (omega)

Question-31. What do we call materials with a low resistance?

Answer-31: Conductors

Question-32. What do we call materials with a high resistance?

Answer-32: Insulators

Question-33. What is the job of a battery in a circuit?

Answer-33: Is the source of the potential difference (Provides the energy)

Question-34. What happens if you add more batteries to a circuit?

Answer-34: More current will flow, the current will increase

Question-35. What happens to the resistance if you add more resistors in series?

Answer-35: it increases

Question-36. What happens to the resistance if you add more resistors to each branch in parallel?

Answer-36: Total resistance decreases

Question-37. In the required practical on measuring resistance, what is the dependent variable?

Answer-37: Resistance

Question-38. For some resistors, the resistance always remains constant. In others, it can change as?

Answer-38: The current changes.

Question-39. At a constant temperature, the current through an ohmic conductor is?

Answer-39: Directly proportional to the potential difference across the resistor.

Question-40. What does it mean that a component is "ohmic"?

Answer-40: Resistance remains constant as current changes.

Question-41. What happens to the resistance of a filament lamp as the potential across the lamp increases?

Answer-41: It increases.

Question-42. Why does the resistance of a filament lamp increase as the potential difference across it increases?

Answer-42: The wire heats up so particles move faster, getting in the way of moving charges more often.

Question-43. Describe the current flow through a diode?

Answer-43: It can only flow in one direction. There is a very high resistance in the reverse direction.

Question-44. Why does a diode only allow current to flow in one direction?

Answer-44: The particles act like a valve, only allowing charges to travel in one direction.

Question-45. What is a thermistor?

Answer-45: A temperature dependent resistor.

Question-46. What happens to the resistance of a thermistor when the temperature increases?

Answer-46: It decreases

Question-47. Why does resistance of a thermistor decrease when the temperature increases?

Answer-47: Thermal energy helps the particles to line up and allow charges through more easily.

Question-48. When would a thermistor be useful?

Answer-48: Thermostats ? to make things change with temperature.

Question-49. What is an LDR?

Answer-49: A Light Dependent Resistor

Question-50. What happens to the resistance of an LDR when the light intensity increases?

Answer-50: It decreases.

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