LDR's and thermistors. Flashcards

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1
Q

formula/ definition of resistance.

A

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

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2
Q

what factors affect the resistance of a component?

A

length.
cross sectional area.
temperature.
material.

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3
Q

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

A

decreases.

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4
Q

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

A

increase as the total resistance decreases.

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5
Q

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

A

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

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6
Q

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

A
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7
Q

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

A

decreases.

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8
Q

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

A

increase as total resistance increases.

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9
Q

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

A

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

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10
Q

what are some typical applications of thermistors?

A

thermostat.

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11
Q

what are some typical applications of LDR’s?

A

switching lights on when it gets dark.

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