Electricity Interview Questions and Answers
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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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