Tag: household circuits
Questions Related to household circuits
A device that is used to break or make an electric circuit is called _________.
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potentiometer
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switch
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breaker
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fuse
The main function of a switch is to
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Allow changes of flow
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Complete or break a circuit
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Make the bulb glow easily
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Prevent electric shocks
An electrical switch is any device used to interrupt the flow of electrons in a circuit. Switches are essentially binary devices: they are either completely on (“closed”) or completely off (“open”).
A switch is always connected to the :
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Live wire
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Neutral wire
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Earth wire
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None of these
A switch is always connected to live wire. The purpose of the switch is to break or connect an electric circuit, but they must be correctly connected at home.
Why are switches not connected to neutral wire?
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Because there will be overheating
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No current will flow through the appliance
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Fuse will blow
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All
If the switches are connected to neutral wire, no current will flow through the appliance and hence it will not operate.
Commonly used switches are
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Clutch type
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Lever type
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Plug type
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All of the above
Commonly used switches are lever type. By moving the lines upward, a given circuit is switched off and vice-versa.
Switches are connected to
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Live wire
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Neutral wire
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Fuse wire
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All of the above
When an appliance is in contact with the live wire, its heating element will be at same potential as the live wire and current will flow.
MCB are
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Miniature circuit Breakers
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Switches
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Pulg
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Fuse
MCB stands for Miniature circuit breakers which opens the circuit when excessive current passes through the appliance and thus prevents the appliance from any damage.
The switch used with an appliance to start or stop the flow of current in it is the
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Double pole switch
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Single pole swicth
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MCB
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All
Single pole switch is used with an appliance to start or stop the flow of current in it.
B). Solve the previous question if the closed loop is completely
enclosed. In the circuit containing the switch.
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An anticlockwise current-pulse
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A clockwise current-pulse
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An anticlockwise current-pulse and then an anticlockwise current-pulse
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A clockwise current-pulse and then an anticlockwise current-pulse
In a household electric circuit
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all electric appliances drawing power are joined in parallel.
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a switch may be either in series or in parallel with the appliance which it controls.
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if a switch is in parallel with an appliance, it will draw power when the switch is in the 'off' position (open).
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if a switch is in parallel with an appliance, the fuse will blow (burn out) when the switch is put 'on' (closed).
In the household if the appliances are connected in series, if one appliance is turned off then the whole circuit breaks and all other will get turned off. So they are always connected in parallel so that we can use appliances independent of other.
The switch of an appliance must be connected in series because the purpose of a switch is to turn off/on (break and connect the circuit). So when we connect the switch in series, the appliance turn's on when switch is closed and off when open.
If the switch is connected in parallel, even when it is off(open) the appliance draws power and when it is on the terminals of the appliance gets shorted and blows the fuse.