An electric heater is designed to operate in `100V` main with a power output of `1000W` .When it is connected to a `25V` source,power output is:

A heater is designed to operate with a power of 1000W in a 100V line. It is connected in combination with a resistace of 10 Omega and a resitance. R, to a 100V mains, as shown in Fig. 6.6 What should be the value of R so that the heat operates with a power of 62.5 W ?

A heater is designed to operate with a power of 1000W in a 100 V line. It is connected in combination with a resistance of 10 Omega and a resistance R , to a 100 V mains as shown in figure. What will be the value of R so that the heater operates with a power of 62.5W ?

A 200 W- 200 V lamp is connected to 250 V mains.it power consuption is

A heater is designed to operate with a power of 1000 walts in a 100 volt line. It is connected in a combinations with a resistance of 10 ohms and a resistance R to a 100 volts mains as shown in figure. What should be the value of R so that the heater operates with a power of 62.5 watts. .

The efficiency of a motor is defined as the ratio of mechanical power output to that with input electric power. The motor is designed to operate at 100 V and it draws a current of 15 A . If output mechanical power of motor is 800 W, then calculate the efficiency of motor .

An electric motor is designed to work at 100 V and draws a current of 6 A . The output power supplied by the motor is 150 W , and the remaining of the motor and its percentage efficiency?