LDR's and thermistors.

Question 1

formula/ definition of resistance.

Answer 1

resistance= potential difference divided by current.
R= V/I.

Question 2

what factors affect the resistance of a component?

Answer 2

length.
cross sectional area.
temperature.
material.

Question 3

thermistor: what does the resistance of a thermistor do as it’s temperature increases?

Answer 3

decreases.

Question 4

thermistor: the resistance decreases as it’s temperature increases but what will that cause to happen to the current in the circuit?

Answer 4

increase as the total resistance decreases.

Question 5

thermistor: the resistance decreases as it’s temperature increases but what will that cause to happen to the potential difference across the resistor?

Answer 5

resistance of resistor is constant so as current increases, potential difference across resistor also increases.

Question 6

thermistor: the resistance decreases as it’s temperature increases but what will that cause to happen to the current in the circuit?

Question 7

LDR’s: what will happen to the resistance of an LDR as the light intensity increases?

Answer 7

decreases.

Question 8

LDR: the resistance decreases as the light intensity increases but what will that cause to happen to the current in the circuit?

Answer 8

increase as total resistance increases.

Question 9

LDR: the resistance decreases as the light intensity increases but what will that cause to happen to the potential difference in the circuit?

Answer 9

increase.
v=RI.
as I increases so will V if R is constant.

Question 10

what are some typical applications of thermistors?

Answer 10

thermostat.

Question 11

what are some typical applications of LDR’s?

Answer 11

switching lights on when it gets dark.