Resistors In Circuits Flashcards Preview

GCSE PHYSICS > Resistors In Circuits > Flashcards

Flashcards in Resistors In Circuits Deck (14):
1

Whats the equation for resistance

Resistance = volts ÷ current

2

What's the equation for volts out

Vout = Vin(r2÷(R1+R2))

3

Describe a ldr image

A resistor with a circle around it and two arrows pointing in

4

What is a ldr used in

Street lamps

5

What happens when light intensity increases with ldr's

The resistance decreases

6

What type of circuit do resistors go in

Potential divider circuits

7

What is a variable resistor used in

Dim switches

8

How do variable resistors work

Has a connection that slides over the wire and reduces the distance the current has to travel over the wire to reduce the resistance

9

Which is more resistant - thick or thin wires

Thin wires

10

Describe the image of a variable resistor

A resistor with a arrow through it pointing from bottom left to top right

11

What happens as heat increases in thermistors

The resistance decreases

12

Describe the image of a thermistor

A resistor with a tick going from top right to outside middle bottom pointing left

13

What circuit does a thermistor use

A potential divider circuit

14

What are thermistors used in

Thermostats