Question

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Mrs.M has bought 3 lamps with each lamp marked 10W,12V for use outside in the garden.each lamp will ba at normal brightness when the voltage is12V.each lamp is to be wired so that it can be swiched on and off independently of the swich,called the master control swich,will allow mrs.M to swich off all the lamps at once if a fault occurs.
(i)Draw a house circuit diagram to show how the lamps are to be wiped up to swiches and the mains.

(ii)Calculate the combined resistance of all 3 lamps in the circuit in (i).

Answer 1

M先生为自己的花园买了三盏灯，每一盏都标识有“10瓦，12伏”。当接入电压为12伏时，灯泡会正常发光。三盏灯需要并联，这样就可以分别独立地开关。当发生漏电时，总开关则可以让M先生立即同时关闭三盏灯。

i)画一个家庭电路图，显示电灯是如何与各开关和干路连接的。
ii)计算电路中三盏灯的总电阻。

Answer 2

M女士买了三个10瓦，12伏的灯泡用于屋外花园。每一盏灯在电压正好12伏时，亮度正常。每个灯泡都连了一根电线保证开关可以独立控制，叫做主控式开关，如果电路发生故障将会保证M女士一下关掉所有灯。