Electricity

Question 1

Explain, in terms of charge carriers, why the resistance of the thermistor decreases as the temperature rises

Answer 1

Extra charge carriers released as temperature rises and overwhelm the effect of increased thermal agitation of atoms resists the flow of charge carrier.

Question 2

Potential Divider

Answer 2

A combination of resistors in series connected across a voltage source

Question 3

Charge Carriers

Answer 3

Charged particles that move through a substance when a PD is applied across it.

Question 4

Critical Temperature

Answer 4

The temperature at and below which a superconducting materials resistivity is zero.

Question 5

Electromotive force (EMF)

Answer 5

The amount of electrical energy per unit charge produced inside a source of electrical energy

Question 6

energy

Answer 6

The capacity to work

Question 7

Internal resistance

Answer 7

Resistance inside a source of electrical energy

Question 8

Negative temperature coefficient

Answer 8

The resistance of a semiconductor decreases when its temperature is increased,

Question 9

Ohm’s law

Answer 9

The potential difference across a metallic conductor is proportional to the current (providing physical conditions do not change)

Question 10

Potential Difference

Answer 10

work done or energy transferred per unit charge between two points when the charge moves from one point to another