All homes have a fuse box to protect against the danger of fire when electrical

Question

All homes have a fuse box to protect against the danger of fire when electrical circuits are overloaded. Older homes have fuses that burn out when tripped and have to be replaced. Newer homes have fuses that flip a switch and can be reset without needing to replace them. Discuss the following: Is it high voltages or high currents which are dangerous and cause a fuse to trip and cut off a circuit? Why? The older style of fuses had a wire which would burn out when the circuit was overloaded. Do you believe this wire would be of small diameter or large diameter? Why? The newer style of fuses use a solenoid to cut the circuit when it is overloaded. How could a solenoid be used to break a circuit?

Explanation / Answer

Is it high voltages or high currents which are dangerous and cause a fuse to trip and cut off a circuit? Why?

high curretn .. because the rate of dissipation through a resistor is given by : heat dissipated = current^2 * resistance ...

so.. higher the curretnn .. higher is the heat loss rate... so more curent is dangerous

The older style of fuses had a wire which would burn out when the circuit was overloaded. Do you believe this wire would be of small diameter or large diameter? Why?

The wire should be of small diameter..

because , the resistacne of a wire is inversely proportional to its diamerter... so less the diameter, more is the resistance and we nedd the resistance of the fuse wire to be large.. so diameter should be small

The newer style of fuses use a solenoid to cut the circuit when it is overloaded. How could a solenoid be used to break a circuit

Solenoid is a device which produces magnetic field when a current passes thorugh it and this magnetic field can be used to pull the switch to off condition..

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