CBSE Class 7 Science Electric Current and Its Effects Worksheet Set 01

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Electric Current and Its Effects

ACTIVITY- 1 : To make an electrc circuit. ` 
 
Question 1- How many terminals are there in an electric cell? Name them.
Answer- Two i.e. positive and negative terminals.
 
Question 2- What is the role of switch in the electric circuit?
Answer- Switch closes (ON) and open (OFF) the electric circuit.
 
ACTIVITY- 2 : Heating effects of electric current. 
 
Question 1- When switch is in ‘ON’ position then bulb ………… and feels …………
Answer- Glows, hot.
 
ACTIVITY- 3 : Heating effects of current in a wire. ` 
 
Question 1- When switch is ‘OFF’ the wire feels hot. (True/False)
Answer- False.
 
Question 2- When swtch is ‘ON’ the wire feels cold. (True/False)
Answer- False.
 
Question 3- If you take any other wire, will you feel the same effect?
Answer- Due to high resistivity of nichrome, it shows large heating effect. Any other wire will produce low heat or it may melt.
 
ACTIVITY- 4 : Magnetic effects of electric current.
 
Question 1- Why a magnetic needle points in NS direction when there is no magnetic substance near it?
Answer- Because earth behaves like a magnet.
 
Question 2- Why magnetic needle gets deflected when a bar magnet is brought near it?
Answer- Because magnetic field of bar magnet, exert force on magnetic needle.
 
Question 3- Why a magnetic needle gets deflected when current is switched ON?
Answer- When current is switched ON, a magnetic field is produced around the wire.
 
ACTIVITY- 5 : To make an electromagnet. 
 
Question 1- Why do the pins get stick to the iron nail when current is passed through it?
Answer- Because on passing electric current, the coil along with iron nail becomes magnet.
 
Question 2- Why the pins fall back after sometime when current is switched off?
Answer- Because coil along with iron nail gets demagnetized when current is switched off.
 
EXERCISE
 
Question 1- Fill In The Blanks :
 
(i). Shorter line in the symbol for cell represents negative terminal.
(ii). Combination of two or more cells is called battery.
(iii). When key is in ON position current flows through the circuit.
(iv). In a battery positve terminal of one cell is connected to negative terminal of next cell.
(v). Electric heater works on the heating effect of current.
 
Question 2- Write True Or False.
 
(i). To make a battery of two cells, positive terminal of one cell is connected to negative terminal of another.(True)
(ii). Electric iron works on the basis of heating effect of current. (True)
(iii). Magnetic crane is based on magnetic effect of current. (True)
(iv). When current flows in the circuit then circuit is called open circuit. (False)
(v). An electric bell works on the principle of electromagnet. (True)
 
Question 3- Match The Column:-
 
7th.sci.eng.july.aug.new 8
 
Question 4. Choose One Option For The Follwing.
 
(i). Which electric appliance is not based on heating effect of current :
a) Electric toaster   b) Loudspeaker (✓)   c) Heater   d) Electric iron
 
(ii). Which of these devices are not based on magnetic effect of current :
a) Room heater (✓)   b) Magnetic crane    c) Electric bell    d) Loudspeaker
 
(iii). The amount of heat produced in wire depends on :
a) Nature of material    b) Length    c) Thickness   d) All of these (✓)
 
(iv). The wire used in the bulb is called :
a) Element    b) Spring    c) Filament (✓)    d) Component
 
(v). An electric bell consists of :
a) Gong    b) Hammer    c) Electromagnet    d) All of these (✓)
 
Question 5- Very Short Answer Type Questions.
 
(i) What is an electromagnet? How does it work?
Answer- The substances which become magnet when current passes through them and losses their magnetic effect when current is switched off, are called electromagnets. These are based on magnetic effect of electric current.
 
(ii) What is a magnetic crane? How does it work?
Answer- Magnetic crane is based on magnetic effect of electric current. It has an electromagnet with which we can pick big containers, separate magnetic materials from garbage.
 
(iii) Draw an electric circuit with one battery, one bulb and one switch in open position.
Answer-
7th.sci.eng.july.aug.new 9
 
Question 6- Short Answer Type Questions.
 
(a) Define the following terms :
(i) An electric cell, (ii) A battery, (iii) Electric circuit, (iv) Open circuit, (v) Closed circuit.
Answer-
(i) An electric cell- It is a source of electric current.
(ii) A battery- It is the combination of two or more than two cells.
(iii) Electric circuit- It is a closed path consists of electric appliances through which electric current flows.
(iv) Open circuit- It is the circuit through which current is not flowing.
(v) Closed circuit- It is the circuit through which current is flowing.
 
Question 7- Long Answer Type Questions.
 
(i) Explain the principle, construction and working of an electric bell using suitable diagram.
Answer-
Principle- Electric bell works on the principle of electromagnet.
Construction- It has main three parts – Electromagnet, gong and hammer.
Working- When we switch on the bell, current flows through the coil via contact screw and coil becomes electromagnet. It attracts the iron strips towards it and hammer strikes the gong to produce sound. In this process circuit break as hammer loss the contact with contact screw. So coil no longer remains electromagnet and do not attract hammer. This process continues again and again and the bell keeps ringing.
7th.sci.eng.july.aug.new 10
 
(ii) What is an electric fuse? How does it work? Why is it essential in an electric supply?
Answer- Electric fuse is a wire made of special materials which melt quickly and break when a large current is passed through it because of short circuit or overloading. Hence it breaks the electric circuit and prevent electric fires and accidents. It also prevents damage to electric appliances.
 

Questions

            Very Short Answer

Q1)      Define current?

Q2)      What is battery?

Q3)      What is element?

Q4)      What is filament?

Q5)      What are the electric components?

           

            Short Answer

Q6)      What do you mean by the term by electric fuse?

Q7)      Distinguish between MCB and MCCB?

Q8)      What do you mean by the electric bell?

Q9)      How short circuit different from overloading?

Q10)    What do you understand by incandescent electric bulbs?

           

            Long Answer

Q11)    Explain about electric circuit and its components?

Q12)    State the difference between electromagnet and permanent magnet?

Q13)    Explain the heating effects of the electric current?

Q14)    Write short note on electric current?

Q15)    Write short on electromagnets? 

 

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Chapter 14 Electric Current and its Effects Practice Sheet and Solutions for Class 7 Science

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