Physics
Grade-7
Easy
Question
Go through the given statements and select the correct option.
Statement 1: In a circuit, the surface of the bulb becomes warmer than the connecting wires when the same current flows through them.
Statement 2: A thin and long wire has higher resistance than a thick and short wire.
- Both statements 1 and 2 are true, and statement 2 is the proper explanation of statement 1.
- Both statements 1 and 2 are true, but statement 2 is not the proper explanation of statement 1.
- Statement 1 is true, and statement 2 is not correct.
- Statement 2 is true, and statement 1 is not correct.
Hint:
Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1
The correct answer is: Both statements 1 and 2 are true, but statement 2 is not the proper explanation of statement 1.
A bulb gets warmer than the wires because the filament of bulb is made up of tungsten which provide greater resistance to the current then the wires, which are good conductors. Higher resistance lead to production of more heat.
A thick wire has smaller resistance while a thin wire has larger resistance. The resistance of a long wire is greater than the resistance of a short wire because electrons collide with more ions as a pass through. Thus, a thin and long wire has higher resistance then a short and thick wire.
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DIRECTIONS: Read the following two statements carefully and choose the correct options.
Statement 1: The heating up of a thin conducting wire on passing an electric current through it is called the heating effect of current.
Statement 2: Various electrical appliances that are based on the heating effect of current contain a coil of wire called an element.
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Statement 1: The heating up of a thin conducting wire on passing an electric current through it is called the heating effect of current.
Statement 2: Various electrical appliances that are based on the heating effect of current contain a coil of wire called an element.
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In which one of the following conditions the amount of heat produced in a current-carrying wire will increase?
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When current is passed through a conductor, the heat produced in it depends upon
I. The material of the conductor
II. The current flowing through the conductor
III. The time for which the current flows
When current is passed through a conductor, the heat produced in it depends upon
I. The material of the conductor
II. The current flowing through the conductor
III. The time for which the current flows
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