P4 - Electric Circuits

Question 1

What are electrical conductors?

Answer 1

-Electrical conductors are materials where electrons are free to move (delocalised)

Question 2

What are electrical insulators?

Answer 2

-Electrical insulators are materials where electrons are fixed in position

Question 3

What is charge is measured in?

Answer 3

-Coulombs

Question 4

How many electrons is one coulombs?

Answer 4

-6,000,000,000,000,000,000

Question 5

What unit is potential difference measured in?

Answer 5

-Volts

Question 6

How do you calculate potential difference?

Answer 6

-Energy transferred / charge

Question 7

What is an electrical circuit?

Answer 7

-An electrical circuit is a path in which electrons flow

Question 8

What is unit for current?

Answer 8

-Amperes

Question 9

What is the equation for current?

Answer 9

-Charge / time

Question 10

What is the resistance equation?

Answer 10

-Potential difference / current

Question 11

What is ohm’s law?

Answer 11

-The current flowing through a resistor, at a constant temperature, is directly proportional to the potential difference across the resistor.

Question 12

What is a thermistor?

Answer 12

-A thermistor is a component which changes its resistance due a change in temperature.

Question 13

What is a LDR?

Answer 13

-An LDR is a component which changes its resistance due to a change in the intensity of light.