Ohm's Law and Resistance
Trending Questions
Q. An unknown circuit draws a current of 2 A from a 12 V battery its equivalent resistance is ________________.
- 24 Ω
- 6 Ω
- 0.167 Ω
- 10 Ω
Q. A 6 V battery is connected across a lamp whose resistance is 20 Ω. Calculate the value of the extra resistance in Ω which must be used in the circuit to get 0.25 A current in the circuit.
4 Ω
6 Ω
2 Ω
8 Ω
Q. According to ohm's law, the plot of the electric current vs the potential difference in a circuit gives a straight line .
- with constant slope
- parallel to current axis
- parallel to voltage axis
Q. Considering the relation between current I, voltage V and resistance R, which of the following equations is/are TRUE?
- V2=I2R2
- R−2=V−2I2
- V2=RI−2
- V−2=R2I−2
Q. Calculate the resistance of a wire, if the voltage is 48 V and the current flowing is equal to 4 A.
- 12
Q. LED is an example of a non-ohmic conductor.
- True
- False
Q. Ohm's law is applicable irrespective of the temperature.
- True
- False
Q. An electric bell has a rating of 500 W and 100 V. It is used in a circuit having a 200 V supply. What resistance must be connected in series with the bulb so that it delivers 500 W?
- 10 Ω
- 20 Ω
- 30 Ω
- 40 Ω