183. How many coulombs are delivered by a storage battery in 25 hours if it is supplying current at the rate of 3 A?

Draw a circuit diagram with a three-cell battery in series with an open switch, a resistor, an ammeter showing the current flowing from the resistor, and a fuse. Also, draw a voltmeter measuring the potential difference across the source.

 A hydroelectric station has a turbine efficiency of 86% and a generator efficiency of 92%. The effective head of water is 150 m. Calculate the volume of water used when delivering a load of 40 Mw for 6 hours.

a. 74.18 x 104 m3

b. 4.158 x 104 m3

c. 82.54 x 103 m3

d. 94.48 x 104 m3

A coil having an inductance of 6 H and an unknown resistance is connected in series with 
a resistor of 10 Ω to a 120 V dc supply. The time constant of the circuit is 300 ms. When 
steady state conditions have been reached, the supply is replaced instantaneously by a short-circuit. Determine the resistance of the coil, the current flowing in the circuit one second after the shorting link has been placed in the circuit, and the time taken for the current to fall to 10% of its initial value.