Advertisements
Advertisements
Question
Define the term resistance.
Solution
Resistance is the obstacle that the wire presents to the current flow.
RELATED QUESTIONS
Two copper wires are of the same length, but one is thicker than the other. Which wire will have more resistance?
Two wires of the same material and same length have radii 1 mm and 2 mm respectively. Compare their resistances.
How are the home appliances connected in general, in series or parallel. Give reasons.
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 |
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 resistance?
The ______ is the measure of opposition offered by the component to the flow of electric current through it.
The process of conduction of electric current through the solution is called ______.
A rheostat is also known as fixed resistance.
Define the following:
Variable resistor
