Advertisements
Advertisements
Question
If the length of a wire is doubled by taking more of wire, what happens to its resistance?
Solution
The area of cross-section of the wire, A = πr2
APPEARS IN
RELATED QUESTIONS
How does the resistance of a pure metal change if its temperature decreases?
State how are the two resistors joined with a battery when equivalent resistance is more than either of the two resistances.
How does the resistivity of a semiconductor depend on temperature?
How does the resistivity of an alloy such as constantace depends on temperature.
State expression for Cells connected in parallel.
Two lamps of resistance 30Ω and 20Ω respectively are connected in series in a 110V circuit. Calculate:
(i) the total resistance in the circuit
(ii) the current in the circuit, and
(iii) the voltage drop across each lamp.
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.
If R1 and R2 be the resistance of the filament of 40 W and 60 W respectively operating 220 V, then:
In an electrical circuit, two resistors of 2 Ω and 4 Ω respectively are connected in series to a 6 V battery. The heat dissipated by the 4 Ω resistor in 5 s will be ______.
