easy question..
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my answer is B as i think the bulb is always fixed to the live wire??
but answer given is C?? so is my answer wrong or is the answersheet?? -
It is C because the switch should be connected to the live wire. The bulb is connected to neutral so that it will always be at a neutral potential when the switch is off.
If it was B, the bulb will always be at a live potential, even when the switch is off. This is extremely dangerous because when someone touch it accidentally, there will be a current flow from the live wire through the person down to the earth, forming a complete circuit. The poor person will then be electrocuted to death -
live wire should be connected to the switch instead of being fed directly to the bulb, if not u'll get electrocuted when changing bulb regardless of ur switch position.
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oh! a very clear explanation thx!Originally posted by eagle:It is C because the switch should be connected to the live wire. The bulb is connected to neutral so that it will always be at a neutral potential when the switch is off.
If it was B, the bulb will always be at a live potential, even when the switch is off. This is extremely dangerous because when someone touch it accidentally, there will be a current flow from the live wire through the person down to the earth, forming a complete circuit. The poor person will then be electrocuted to death
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Originally posted by ^tamago^:live wire should be connected to the switch instead of being fed directly to the bulb, if not u'll get electrocuted when changing bulb regardless of ur switch position.
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to clarify...
so in a circuit the fuse can be placed before the switch as well as placed after a switch?? (in the live wire) -
Yes.Originally posted by amusing_dick:to clarify...
so in a circuit the fuse can be placed before the switch as well as placed after a switch?? (in the live wire) -
no, it has to be before a switch.Originally posted by ^tamago^:Yes.
This is because when the fuse blows, the switch will not be at live potential anymore.
If the fuse is after the switch, when the fuse blows, the switch is still at live potential, which is still dangerous to the user -
Oh yeah.Originally posted by eagle:no, it has to be before a switch.
This is because when the fuse blows, the switch will not be at live potential anymore.
If the fuse is after the switch, when the fuse blows, the switch is still at live potential, which is still dangerous to the user