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Practice each question, then open the answer or worked solution.
An electrician is carrying out some repairs in your house. He wants to replace a fuse with a piece of wire. Would you agree? Give reasons for your response.
It is not a wise idea to replace the fuse with a piece of wire, as it has a very low melting point. In the case of the metal piece, the melting point will be high, and the circuit will be intact in case there is overload or overheating.
Zubeda made an electric circuit using a cell holder shown in Fig. 14.4, a switch and a bulb. When she put the switch in the ‘ON’ position, the bulb did not glow. Help Zubeda to identify the possible defects in the circuit.
The reasons may be as follows:
i) The connecting wire may be loose
ii) The electric cell may be used up
iii) Switch may not be functioning well
iv) Cell power has been exhausted
In the circuit shown in Fig. 14.25
(i) Would any of the bulb glow when the switch is in the ‘OFF’ position?
(ii) What will be the order in which the bulbs A, B and C will glow when the switch is moved to the ‘ON’ position?
i) No, the bulb will not glow as the circuit is not complete when the switch is off.
ii) If the switch is ‘ON’, all the bulbs glow simultaneously.
BYJU’S presents practice exercises, revision notes, and electric current questions and answers, which will help students understand the chapter and clarify their doubts, and thus prepare well for the annual exams.
Important Topics Covered in NCERT Solutions for Class 7 Science Chapter 14 Electric Current and Its EffectsGetting well-versed in Class 7 Electric Current concepts is very crucial for students. Current topics given in NCERT Class 7 textbooks play a pivotal role in examinations. It is very important to practise the symbols, circuit diagrams, formulae and problems to score good marks. At BYJU’S, downloadable files of e-books, notes, PDFs, and solved previous years’ question papers are available for students to start their exam preparation without delay.
To know more about how to represent electric components by symbols, draw circuit diagrams, the heating effect of current and its applications, electric fuse, magnet-like behaviour of electric current while flowing through a wire, electromagnet, applications of electromagnets, etc., sign up with BYJU’S The Learning App. Once you have registered with BYJU’S, access to the online course is very simple.
Apart from NCERT Solutions for Class 7 Science Chapter 14, get NCERT Solutions for Class 7 Science other chapters here. Students can download worksheets, assignments, NCERT Class 7 Science Solutions and other study materials for exam preparation and score good marks.