What is a circuit diagram? Draw the labelled diagram of an electric circuit comprising of a cell, a resistor, an ammeter, a voltmeter and a closed switch (or closed plug key). Which of the two has a large resistance: an ammeter or a voltmeter?

An electric bulb is rated as 10W, 220V. How many of these bulbs can be connected in parallel across the two wires of 220V supply line if the maximum current which can be drawn is 5A?

A resistor of 8 ohms is connected in parallel with another resistor X. The resultant resistance of the combination is 4.8 ohms. What is the value of the resistor X?

What is a voltmeter? How is a voltmeter connected in the circuit to measure the potential difference between two points. Explain with the help of a diagram.

In 10s, a charge of 25C leaves a battery, and 200j of energy are delivered to an outside circuit as a result.

1. What is the p.d. across the battery?
2. What current flows from the battery?

Ten bulbs are connected in a series circuit to a power supply line. Ten identical bulbs are connected in a Parallel circuit to an identical power supply line.

1. Which circuit would have the highest voltage across each bulb?
2. In which circuit would the bulbs be brighter?
3. In which circuit, if one bulb blows out, all others will stop glowing
4. Which circuit would have less current in it?

State and explain Joule’s law of heating.

Three 2V cells are connected in series and used as a battery in a circuit.

1. What is the p.d. at the terminals of the battery?
2. How many joules of electrical energy does 1C gain on passing through

1. One cell.
2. All three cells?