Lakhmir Singh and Manjit Kaur Solutions for Chapter: Electricity, Exercise 7: Short Answer Type Questions

If a potential difference of $10 \mathrm{V}$ causes a current of $2 \mathrm{A}$ to flow for $1 \mathrm{minute}$, how much energy is transferred?

Define the unit of electric current (or Define ampere).

A radio set draws a current of $0.36 \mathrm{A}$ for $15 \mathrm{minutes}$. Calculate the amount of electric charge that flows through the circuit.

Draw circuit symbols for (a) fixed resistance (b) variable resistance (c) a cell (d) a battery of three cells (e) an open switch (f) a closed switch.

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?

If the charge on an electron is $1.6\times {10}^{-19} \mathrm{coulombs}$, how many electrons should pass through a conductor in $1 \mathrm{second}$ to constitute $1 \mathrm{ampere}$ current?

The p.d across a lamp is $12 \mathrm{V}$. How many $\mathrm{joules}$ of electrical energy is changed into heat and light when:
(a) a charge of $1 \mathrm{C}$ passes through it?
(b) a charge of $5 \mathrm{C}$ passes through it?
(c) a current of $2 \mathrm{A}$ flows through it for $10 \mathrm{s}$?

In $10 \mathrm{s}$, a charge of $25 \mathrm{C}$ leaves a battery and $200 \mathrm{J}$ of energy is delivered to an outside circuit as a result:
(a) What is the p.d. across the battery?
(b) What current flows from the battery?