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प्रश्न
What material is used for making wire to prepare heating coils? Give a reason.
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उत्तर
Nichrome is used for making wire to prepare heating coils. The reason is that its melting point is high and its resistivity is also high.
संबंधित प्रश्न
In series combination which remains constant?
(a) Voltage
(b) Current
(c) Both current and voltage
(d) Both are variables
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Give the law of combination of resistances in series.
A p.d. of 4 V is applied to two resistors of 6 Ω and 2 Ω connected in series. Calculate:
(a) the combined resistance
(b) the current flowing
(c) the p.d. across the 6 Ω resistor
State how are the two resistors joined with a battery when equivalent resistance is more than either of the two resistances.
What do you mean by power rating of an electrical appliance? How do you use it to calculate
(a) the resistance of the appliance and
(b) the safe limit of the current in it, while in use?
State expression for Cells connected in parallel.
Calculate the equivalent resistance between P and Q from the following diagram:
Two resistors of 4Ω and 6Ω are connected in parallel to a cell to draw 0.5 A current from the cell.
Draw a labelled circuit diagram showing the above arrangement.
