Advertisements
Advertisements
प्रश्न
Name the material which is the best conductor of electricity.
Advertisements
उत्तर
Silver is the best conductor of electricity.
APPEARS IN
संबंधित प्रश्न
Find the expression for the resistors connected in series and write the two characteristics of it. (Draw figure).
A battery of 9 V is connected in series with resistors of 0.2 Ω, 0.3 Ω, 0.4 Ω, 0.5 Ω and 12 Ω, respectively. How much current would flow through the 12 Ω resistor?
Find the equivalent resistance between points A and B
How does the resistance of a pure metal change if its temperature decreases?
Give one example to show how the resistance depends on the nature of material of the conductor.
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
A graph is plotted taking p.d. along y-axis and electric current along x-axis. Name the physical quantity that represents the slope of this graph (Fig.).
Name the following substances:
(i) Showing low resistivity,
(ii) Showing very high resistivity,
(iii) Showing moderate resistivity.
What potential difference is needed to drive a current o f 1 A through a 5 Ω resistor?
When do you say that the resistors are connected in this way? Draw a circuit diagram.
The voltage applied to a given rheostat is made four times its initial value. By what factor will be resistance of the rheostat change?
State and explain the laws of resistance.
In the circuit shown below, calculate the equivalent resistance between the points (i) A and B, (ii) C and D.
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 having 2Ω and 3Ω resistance are connected—(i) in series, and (ii) in parallel. Find the equivalent resistance in each case.
What is the maximum resistance which can be made using five resistors each of `1/5` W?
