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Electric Circuit and Circuit Diagram

What do the f...

Question

What do the following symbols mean in circuit diagrams?
(i) (ii)

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Solution

1) Variable resistance
2) Closed key

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Q. The schematic diagram, in which different components of the circuit are represented by the symbols conveniently used, is called a circuit diagram. What do you mean by the term components?

Q. What symbol is used for drawing connecting wires in a circuit diagram ?

Q. (a) Name an instrument that measures electric current in a circuit. Define the unit of electric current.
(b) What do the following symbols mean in circuit diagrams?
(i)

(c) An electric circuit consisting of a 0.5 m long nichrome wire XY, an ammeter, a voltmeter, four cells of 1.5 V each and a plug key was set up.
(i) Draw a diagram of this electric circuit to study the relation between the potential difference maintained between the points 'X' and 'Y' and the electric current flowing through XY.
(ii) Following graph was plotted between V and I values:

What would be the values of

\frac{V}{I}

ratios when the potential difference is 0.8 V, 1.2 V and 1.6 V, respectively? What conclusion do you draw from these values?

The 'symbols' in a circuit diagram represent the components of the electric circuit.

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