Explanation
A fuse wire of certain material and guage will melt at a certain current no mater how long it is, so length is not a factor in current rating the shorter it can be made the less resistance it will have end to end.
Neutral temperature is independent of temperature of cold junction
Neutral temperature is defined as a temperature at which elctromotive force of thermocouple attains its maximum value. For a given thermocouple neutral temperature is constant.
Potential Difference (V) across all the devices is same in case of parallel connection to the electrical appliance. So, even any of devices is removed or get fused, the other appliances work as circuit is complete for other devices.
Current through both bulbs is same as both are connected in series. Also rated power of 25W is less than 100 W . So 25W bulb has higher resistance, heating in 25 W bulb is more than that of 100 W bulb . So, 25 W bulb will get fused.
Two coils are connected in series. So, time taken tp = t1 + t2 = 20 + 20 = 40 min.
1 coulomb × 1 Volt = 1 Watt.
Let A, B and C be the resistance of same magnitude R
Let i be the total current. So, i be the total current through resistor A and i /2 be the current through resistors B and C.
Let heat produced in resistor A, B and be HA, HB and HC respectively.
Therefore, HA = i 2R ; HB = i 2R/4 = HC
So, Heat produced is maximum in resistor A.
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