Unit 2 -- Circuit: Microscopic Explanation

Front

Effect of increasing temperature on a thermistor: What happens to the number of conduction electrons and the amplitude of lattice vibrations?

Back

Number of conduction electrons increases; Amplitude of lattice vibrations increases.

Front

As the temperature of the filament in a bulb decreases, what happens to the resistance of the filament?

Back

Lattice vibrations decrease

Front

How does the number of conduction electrons in a light dependent resistor change as light intensity increases?

Back

It increases because the electrons gain energy from the photons of light.

Front

Changes in resistance of a thermistor and a metal wire when temperature is increased?

Back

Resistance of thermistor decreases, resistance of metal wire increases.

Front

As temperature increases, the resistance of a negative temperature coefficient thermistor changes. Why?

Back

More conduction electrons are released.

Front

A light dependent resistor (LDR) and a fixed resistor are connected in a circuit, as shown. The intensity of the light incident on the LDR is increased. What does not take place as the light intensity is increased?

Back

The total power dissipated in the circuit decreases.

Front

Increase in light intensity on LDR: Change in conduction electrons and resistance? Options: A, B, C, D

Back

C

Front

When the temperature of a metal wire increases, the resistance of the wire increases. Which of the following explains this increase in resistance?

Back

the amplitude of the lattice vibrations increases