Advertisements
Advertisements
Question
Name a device that helps to maintain a potential difference across a conductor.
Solution
Any source of electricity like battery, cell, power supply, etc. helps to maintain a potential difference across a conductor.
APPEARS IN
RELATED QUESTIONS
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.
What is a voltmeter?
The device used for measuring potential difference is known as:
The unit for measuring potential difference is:
If a potential difference of 10 V causes a current of 2 A to flow for 1 minute, how much energy is transferred?
Keeping the potential difference constant, the resistance of a circuit is halved. By how much does the current change?
A current of 5 amperes flows through a wire whose ends are at a potential difference of 3 volts. Calculate the resistance of the wire.
If the potential difference between the end of a wire of fixed resistance is doubled, by how much does the electric power increase?
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.
The differences between the electrostatic potential of the positive end the negative end of an electric cell is the ______ of the cell.
A current of 0.2 A flows through a wire whose ends are at a potential difference of 15 V. Calculate:
(i) The resistance of the wire, and
(ii) The heat energy produced in 1 minute.
Calculate the current flowing through each of the resistors A and B in the circuit shown in the following figure.
Write an expression for the electrical power spent in flow of current through a conductor in terms of current and resistance.
A V-I graph for a nichrome wire is given below. What do you infer from this graph? Draw a labelled circuit diagram to obtain such a graph.
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.
The SI unit of potential difference is ______.
Name the instrument which is used to measure the potential difference.
Define Electric potential.
What is the measure of the work done on the unit positive charge to bring it to that point against all electrical forces?
