The SI unit of charge is volt. - Science and Technology 1


The SI unit of charge is volt.




The SI unit of charge is coulomb.

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2012-2013 (March)



1 A = _________ mA

  1. 102
  2. 103
  3. 10-3
  4. 10-6

Define the unit of current.

Fill in the blank:

To increase the effective resistance in a circuit the resistors are connected in _____________.

Choose the correct alternative and rewrite the following sentence.

When the resistance of a conductor increases, the current will ________ increase.

Draw the electrical symbols of the following components and state its use

Wire crossing

Draw the electrical symbols of the following components and state its use:

Rheostat (variable resistance)

Draw the electrical symbols of the following components and state its use:


Which of the following units could be used to measure electric charge?

(a) ampere
(b) joule
(c) volt
(d) coulomb

The atoms of copper contain electrons and the atoms of rubber also contain electrons. Then why does copper conduct electricity but rubber does not conduct electricity?

 In which direction does conventional current flow around a circuit?

Fill in the folloing blank with suitable words:  

 Current is measured in ............... using an ............... placed in ............... in a circuit.

A flash of lighting carries 10 C of charge which flows for 0.01 s. What is the current? If the voltage is 10 MV, what is the energy?

Three resistors are connected as shown in the diagram.

Through the resistor 5 ohm, a current of 1 ampere is flowing.

(i) What is the current through the other two resistors?
(ii) What is the p.d. across AB and across AC?
(iii) What is the total resistance

Draw a circuit diagram to show how two 4 V electric lamps can be lit brightly from two 2 V cells.

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. 

(d) Which circuit would have less current in it?


How does the heat H produced by a current passing through a fixed resistance wire depend on magnitude of current I?

A wire 3 ohm resistance and 10 cm length is stretched to 30 cm length. Assuming that it has a
uniform cross section, what will be its new resistance?

A circuit consists of a resistor of 1 ohm in series with a parallel arrangement of resistors of 12 ohm and 6 ohm. Calculate the total resistance of the circuit. Draw a diagram of the arrangement.

Tell the odd one out. Give a proper explanation.

The following table shows the current in Amperes and potential differences in Volts.

  1. Find the average resistance.
  2. What will be the nature of the graph between the current and potential difference? (Do not draw a graph.)
  3. Which law will the graph prove? Explain the law.
V (volts) I (amp)
       4         9
       5       11.25
       6       13.5

Match the pairs.

‘A’ Group  ‘B’ Group 
1. Free electrons a. V/R 
2. Current b. Increases the resistance in the circuit 
3. Resistivity c. Weakly attached 
4. Resistances in series d. VA/LI

If a charge of 420 C flows through a conducting wire in 5 minutes what is the value of the current?

An electric current flowing in a wire creates __________ around the wire. 

What happens to the resistance if the conductor is made thinner?

Give two uses of conductors.

What is fuse? Name the material of fuse.

How does an alternating current differ from the direct current?

Tick(✓) the correct choice in the following:

24 watt, 12 volt head lamp is fully lit by connecting it to a 12 volt
battery. The working resistance of the lamp is

An auto lamp is joined to a battery of e.m.f. 4 V and internal resistance 2.5Ω. A steady current of 0.5 A flows through the circuit. Calculate the
(a) Total energy provided by battery in 10 minutes,
(b) Heat dissipated in the bulb in 10 minutes.

Fill in the blank :

1 mA = ............................. A.

State whether the following statement is True or False:

The SI unit of charge is the coulomb. 

What should I choose ___________________

a. for decreasing resistance in a circuit.
(Resistors in series / Resistors in parallel)

b. for getting protection from electric current.
(Nickel / Ebonite)

c. to measure the current in the circuit?
(Ammeter/ Voltmeter) 

My mother was operating washing machine on Sunday morning. Suddenly, she saw a spark coming out of the electric board and the electric current in the house failed. An electrician was called to look into the matter. What should he have noticed.

What determines the direction of flow of electrons between two charged conductors kept in contact?

An electric bulb is marked 100 W, 250 V. How much current will the bulb draw if connected to a 250 V supply?

Small amounts of electrical current are measured in milliampere (mA). How many milliampere are there in 0.25 A ?

______ is used to measure the electric current.

True or False – If False give the correct answer

The representation of the electric current is A

Water : pipe :: Electric current : ______.

What is the speed of electric current?

Define an electric current.

In current electricity, a positive charge refers to ______.

Define electric current and give its unit.

Kilowatt hour is the unit of

The power of an electric device is a product of ______ and ______.

MCB is used to protect household electrical appliances.

The SI unit for electric current is the coulomb.

One unit of electrical energy consumed is equal to 1000 kilowatt-hour.

Match the items in column-I to the items in column-II:

Column - I Column - II
(i) electric current (a) volt
(ii) potential difference (b) ohm meter
(iii) specific resistance (c) watt
(iv) electrical power (d) joule
(v) electrical energy (e) ampere

Name any two devices, which are working on the heating effect of the electric current.

  1. What is meant by electric current?
  2. Name and define its unit.
  3. Which instrument is used to measure the electric current? How should it be connected in a circuit?

Unit of electric power may also be expressed as

The flow of electric charge per unit time is called potential difference.

Match the following:

1. 1 mA a. series
2. 1 pA b. ohmmeter
3. Ammeter  c. 10-6 ampere
4. Electrical resistivity d. 10-3 ampere

Problems for practice:

If 5A current flows through a circuit, then convert the current in terms of microampere?

Problems for practice:

If 3A current flows through a circuit, then convert the current in terms of a milliampere.

What are the effects of electric current?

The number of electrons constituting a 1-coulomb charge is ______.

An ammeter is always placed in parallel with the circuit.

For current to flow, one needs art open circuit.

Calculate the current in a wire if a charge of 1500 coulomb flows through it in 5 minutes.

1020 electrons, each having a charge of 1.6 x 10-19 C, flows in a circuit V is 0.1s. What is the current in ampere?

Define the following:

Conventional current and electron current

Match the items in column-I to the items in column-II:

Column - I Column - II
(i) electric current (a) volt
(ii) potential difference (b) ohm meter
(iii) specific resistance (c) watt
(iv) Electrical power (d) joule
(v) electrical energy (e) ampere

Find the odd one out.


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