Advertisements
Advertisements
Question
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 |
Advertisements
Solution
Resistance(R) = \[\frac{\text{∆V}}{\text{∆I}}\]
= 10.2 – `"6.7"/"3"` – 2 = 3.5/1
R = 3.5Ω
APPEARS IN
RELATED QUESTIONS
Name three factors on which resistance of a given wire depends and state how is it affected by the factors stated by you.
Two wires of the same material and same length have radii 1 mm and 2 mm respectively. Compare their 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.
The resistance of a straight conductor is independent of ______.
The resistance of a conductor is R. If Its length is doubled, then its new resistance will be ______.
The process of conduction of electric current through the solution is called ______.
Match the following:
| Column I | Column II | ||
| 1. | Resistor | a. | Galvanometer |
| 2. | Connecting wire | b. | Voltmeter |
| 3. | Current in an electric circuit | c. | Copper |
| 4. | Potential difference | d. | Constantan |
|
5 bulbs are connected in series in a room. One bulb is fused. It is removed and remaining 4 bulbs are again connected in series to the same circuit. What will be the effect on the following physical quantities? (Increases, Decreases, Remain Same). |
- Resistance
- Intensity of light
Observe the given circuit diagram and answer the questions that follow:
- Calculate the resistance of the circuit when the key K completes the circuit.
- Calculate the current through 3Ω resistance when the circuit is complete.
Two copper wires are of the same length, but one is thicker than the other. Which wire will have more specific resistance?
