Advertisements
Advertisements
प्रश्न
The figure blow shows a variable resistor in a dimmer switch.
How would you turn the switch to make the lights: (a) brighter, and (b) dimmer? Explain your answer.
उत्तर
The switch is turned to the right for brighter light and is turned to the left for dimmer light. This happens because when the switch is turned to the right, it offers less resistance and when turned to the left, it offers more resistance.
APPEARS IN
संबंधित प्रश्न
Why are alloys commonly used in electrical heating devices? Give reason.
Distinguish between good conductors, resistors and insulators. Name two good conductors, two resistance and two insulators.
What happens to the resistance as the conductor is made thinner?
Which has more resistance:
a long piece of nichrome wire or a short one?
What will be the resistance of a metal wire of length 2 metres and area of cross-section 1.55 × 10−6 m2 if the resistivity of the metal be 2.8 × 10−8 Ω m?
How does the resistance of a conductor depend on:
length of the conductor?
Calculate the area of cross-section of a wire if its length is 1.0 m, its resistance is 23 Ω and the resistivity of the material of the wire is 1.84 × 10−6 Ω m.
How will you infer with the help of an experiment that the same current flows through every part of the circuit containing three resistors R1, R2 and R3 in series connected to a battery of V volts?
Assertion: Conductors allow the current to flow through themselves.
Reason: They have free charge carriers.
The resistance of a wire of 0.01 cm radius is 10 Ω. If the resistivity of the wire is 50 × 10-8 Ω, find the length of this wire.
