An electric coil of resistance R is immersed in 1kg of water at 20°C. The coil is connected in series with a resistor Y across a 240V mains supply. The temperature of the rises to the boiling point in 10mins. When Y is disconnected, the time taken for 1kg of water at the same temperature is reduced to 6mins neglecting all heat loses, calculate the resistance Ry of R. (Specific heat capacity of water=4200Jkg^-1K^-1)
Ohm's law
Ohm’s law is a prominent concept in physics and electronics. It gives the relation between the current and the voltage. It is used to analyze and construct electrical circuits. Ohm's law states that the voltage across a conductor is directly proportional to the current flowing through it.
Path of Least Resistance
In a series of alternate pathways, the direction of least resistance is the actual or metaphorical route that offers the least resistance to forwarding motion by a given individual or body.
An electric coil of resistance R is immersed in 1kg of water at 20°C. The coil is connected in series with a resistor Y across a 240V mains supply. The temperature of the rises to the boiling point in 10mins. When Y is disconnected, the time taken for 1kg of water at the same temperature is reduced to 6mins neglecting all heat loses, calculate the resistance Ry of R. (Specific heat capacity of water=4200Jkg^-1K^-1)
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