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प्रश्न
An electric bulb draws 0.5 A current at 3.0 V. Calculate the resistance of the filament of the bulb.
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उत्तर
I = 0.5 A, V = 3.0 V
Resistance of filament of the bulb R = `"V"/"I" = 3.0/0.5 = 6 Omega`
संबंधित प्रश्न
The values of current (I) flowing through a given resistor of resistance (R), for the corresponding values of potential difference (V) across the resistor are as given below:
| V (volts) | 0.5 | 1.0 | 1.5 | 2.0 | 2.5 | 3.0 | 4.0 | 5.0 |
| I (amperes) | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 | 0.6 | 0.8 | 1.0 |
Plot a graph between current (I) and potential difference (V) and determine the resistance (R) of the resistor.
Which of the following statements correctly defines a volt?
(a) a volt is a joule per ampere.
(b) a volt is a joule per coulomb.
State whether a voltmeter has a high resistance of a low resistance. Give reason for your answer.
If the potential difference between the ends of a fixed resistor is halved, the electric power will become:
The V-I graph for a series combination and for a parallel combination of two resistors is shown in Fig – 8.38. Which of the two, A or B, represents the parallel combination? Give a reason for your answer.
100 J of heat is produced each second in a 4 Ω resistor. The potential difference across the resistor will be:
Find out the following in the electric circuit given in Figure
- Effective resistance of two 8 Ω resistors in the combination
- Current flowing through 4 Ω resistor
- Potential difference across 4 Ω resistance
- Power dissipated in 4 Ω resistor
- Difference in ammeter readings, if any.
______ is work done per unit charge.
Electric potential is a measure of the ______ on the unit positive charge to bring it to that point against all electrical forces.
Two charged spherical conductors of radius R1 and R2 are connected by a wire. Then the ratio of surface charge densities of the spheres (σ1/σ2 ) is ______
