1. A 20 ohms resistor is connected in parallel with resistor " R " and the combination is then connected in series with 10 ohms resistor. Find the value of " R " if the equivalent total resistance between them is also equal to " R " ?

2.Two equal resistors R1 and R2 are connected in parallel. If the total voltage is equal to the total current, find R1 and R2 .

3. The resistance of a given electric device is 46 ohms at 25 0C. If the temperature coefficient of resistance of the material is 0.00454 at 20 0C determine the temperature of the device when its resistance is 92 ohms.

4. A electric motor operates 20 hours a day, 20 days a month, at an average output of 20 Hp. Calculate the cost of supplying this energy if the billing rate is constant at 1.5 cents per kwhr?

5.A coil of copper wire (  = 10.37 ) has a length of 600 feet. What is the length of an aluminum conductor (  = 17 ) if its cross-sectional area and resistance are the same ?

6.. Three resistors with values 1, 2 and 3 ohms respectively are connected in parallel. The combination is in series with 6 ohms resistor across a supply battery. The resistor that carries minimum current is

7. A electric motor operates 20 hours a day, 20 days a month, at an average output of 20 Hp. Calculate the cost of supplying this energy if the billing rate is constant at 1.5 cents per kw-hr.?

8.. A variable resistor R is connected in parallel with a 30 ohms resistor and the combination is connected in series with a 6 ohms across a 120 volts source. What are the values of R so that the power in it is equal to that of a 6 ohms resistor?

9. 8 ohms, 12 ohms and a variable resistor are connected in parallel. To what value in kilohm should resistor R be adjusted so that the power in 12 ohms resistor shall be 441 watts, if the total current is 20 amperes?