chapters 17-19

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Across
  1. 2. work done by source in driving 1C of charge round a complete circuit
  2. 4. work done to drive 1C of charge
  3. 5. resistance of variable resistor is determined by ___
  4. 8. ratio of pd across component to current flowing through it
  5. 11. fuse contains a piece of wire that melts easily that protects equipment against _____ in circuit
  6. 12. colour of neutral wire
  7. 13. protects user of appliance from electrical shock by preventing possibility of external casing become live
Down
  1. 1. colour of live wire
  2. 3. what affects resistance?
  3. 6. current flowing through a metal wire is directly proportional to pd across ends of conductor provided that temp is constant
  4. 7. colour of earth wire
  5. 9. switches, fuses & circuit breaker must be wire into ____ of household circuit
  6. 10. rate of flow of charges