Break circuits F uses are used to break circuits if the current passing through it is TOO LARGE that may probably cause damages to the appliances.

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Presentation transcript:

break circuits F uses are used to break circuits if the current passing through it is TOO LARGE that may probably cause damages to the appliances.

Typical fuse ratings : 0.1 A, 0.5 A, 1 A, 3 A, 5A, 13 A, 15 A, 30A, etc. * If the current in the circuit is greater than the fuse rating, the fuse breaks the circuit then. * Heater (220V, 2200 W) Operating current or max. current = P / V = 2200 / 220 = 10 A Which fuse rating should be chosen in order to protect the heater? A. 5AB. 10AC. 13AD. 15A * e.g. Operating current (max. current)Fuse rating chosen 0.25 A 0.5 A 2.5 A 3 A 3.5A 5A 1A 3A 5A

C ircuit Breaker

Electricity Meter / Kilowatt-hour meter (kWh meter) 1 kWh = * kWh : unit of electricity * 1 kWh = 1 unit = (1000 W) (60 x 60 s) = J (1 kW) (1 hr)

Units consumed consumed Amount charged for electricity The HongKong Electric Co. Ltd 香港電燈有限公司

Name & Address China Light and Power Hong Kong Ltd 中華電力有限公司 Total units consumed = 713 For first 400 units, $0.862 per unit. Others : $0.932 per unit Total amount charged for electricity = $ $ = $ Average cost of electricity = $ / 713 = $ Other charges