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Electrical Energy Sources

Electrical Energy Sources. Household appliances. Power ratings of appliances. Clock 10W Table lamp 100W Drill 750W Iron 1.2kW Kettle 2.4kW Immersion heater 3.0kW Cooker 11.5kW. Power Rating Label. Frequency 50 Hz. Voltage 230V ~. Double insulated. Power 2000W.

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Electrical Energy Sources

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  1. Electrical Energy Sources

  2. Household appliances

  3. Power ratings of appliances • Clock 10W • Table lamp 100W • Drill 750W • Iron 1.2kW • Kettle 2.4kW • Immersion heater 3.0kW • Cooker 11.5kW

  4. Power Rating Label Frequency 50 Hz Voltage 230V ~ Double insulated Power 2000W

  5. Power Rating Plate Model BD 760K Drill 230V ~ 50 Hz 750 W Made in Spain Model 4597 iron 230 V ~ 50 Hz 1200 W Made in UK

  6. What’s the difference?

  7. Flexes and Power

  8. Fuses and safety

  9. Plugs and fuses Metal contact Thin wire casing Fuse symbol

  10. Fuses must be connected to the live terminal Live 230V Neutral 0V Live 230V Neutral 0V If fuse blows lamp is only connected to neutral (0V) so is safe If fuse blows lamp is stillconnected to live and so is at a high voltage The same principle applies to switches. Switches must always be connected to the live terminal.

  11. Extension lead wiring Earth Live Live Neutral Neutral

  12. Light socket wiring

  13. What’s the difference?

  14. What’s the difference? 1.5V D.C. Safe, runs out 230V A.C. Can be fatal, continuous supply

  15. Direct Current (DC) +ve +ve -ve -ve Cells are typically 1.5V DC

  16. Time base ms/division AC/DC switch 0V Y axis V/div

  17. Direct Current + 6V - 6V Connections reversed Y input positive

  18. Alternating Current The mains supplies 230V AC (Alternating Current) 50Hz

  19. Alternating Current Mains current cycles from positive to negative 50 times per second (50Hz) Signal pattern is the same independent of how the leads are connected

  20. 8V peak Alternating Current Vpeak = √2 Vmeasured Multimeter 5.8V

  21. AC and DC • A cell or battery provides direct current (DC). The electrons always flow in the same direction (negative to positive). A typical cell has a voltage of 1.5V. • If the electricity supply is AC (alternating current) the current constantly changes direction. Mains electricity is 230V AC at 50Hz. This means that the current cycles from positive to negative 50 times per second. • The measured AC voltage is less than the peak voltage (by a factor of √2). This is called the RMS (root mean square) value.

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