Advertisements
Advertisements
Question
Define the term resistance.
Advertisements
Solution
Resistance is the obstacle that the wire presents to the current flow.
APPEARS IN
RELATED QUESTIONS
How does the resistance of a wire depend on its radius? Explain your answer.
Two wires of the same material and same length have radii 1 mm and 2 mm respectively. Compare their resistances.
Exercise.
The values of current (I) flowing through a resistor for various potential differences V across the resistor are given below. What is the value of resistor?
| I (ampere) | 0.5 | 1.0 | 2.0 | 3.0 | 4.0 |
| V (volt) | 1.6 | 3.4 | 6.7 | 10.2 | 13.2 |
The effective resistance of three resistors connected in series is lesser than the lowest of the individual resistances.
An electric bulb is rated ‘240 V, 100 W’.
- What information can you get from the above statement?
- What will happen if this bulb is connected across 220 V?
- Calculate the resistance of the bulb.
- Also find the energy consumed by the bulb in 10 minutes.
What is the maximum resistance one can make with ten 1Ω resistors?
Resistors are connected in series if the resistance of the electric circuit is to be ______.
Three resistors are connected in parallel with a battery. If the current in each resistor is 2A, then the current through the battery will be ______.
A rheostat is also known as fixed resistance.
Define the following:
Variable resistor
