What will be the ratio of the effective resistance of 3 resistances, if they are connected in series and then in parallel ?
R
R2
9
1
What is the Resistance of an ideal ammeter?
Infinity
Zero
High
Low
Filament of the electric bulb is made up of
Silver
copper
Aluminium
Tungsten
What is the relation between resistance (R) of a wire and its radius (r) ?
Find the resistance of a conductor if 0.32 A current is passing through it and a potential difference of 64 V is applied across it.
199 Ω
200 Ω
201 Ω
202 Ω
How many bulbs of 10 Ω should be joined in parallel to draw a current of 4 A from a battery of 8 V ?
3
4
5
6
Which of the following statement is not correct ?
i) If the resistors are connected in series, the current is the same in every part of the circuit.
ii) Series combination is used to increase resistance in a circuit.
iii) If the resistors are connected in parallel, the effective resistance of the combination is more than the individual resistance in the combination.
iv) In parallel combination, the voltage across each resistor is different.
(i) &(ii)
(ii) & (iv)
(ii) & (iii)
(iii) & (iv)
The resistance of the filament of a bulb is 10,000Ω. It is drawing a current from a source of 230V. How much current is flowing through it?
0.23 A
0.023 A
0.0023 A
0.00023 A
Why are copper wires used as connecting wires ?
copper is available in abundance
copper conducts electricity and heats up appliances.
Electrical resistivity of copper is low.
Copper is cheap.
Find the amount of work done if 2C of charge is moved through a potential difference of 9 V.
16J
17J
18J
19J
