The circuit above consists of an a. c. voltage input, a diode, a resistor and a voltmeter.

(a) Identify the circuit.

(b) Draw the waveform for the output voltage.

Which of the current-voltage characteristics shown above is that exhibited an ohmic conductor? 

When two cells of negligible internal resistances and equal e.m.f. denoted by E\(_1\) and E\(_2\) are connected in parallel, combined e.m.f. E is given by
 

In the diagram above, a bulb is lit by drawing 2.0A from 440V a.c. source. Calculate the cost of keeping the bulb on for two days at $0.40 per kilowatt-hour .                 

Three cells each of emf, 1.0 V, and internal resistance, 2 \(\Omega\), are connected in parallel across a 3\(\Omega\)  resistor. Determine the current in the resistor.