Electricity

Question 1

What is electricity?

Answer 1

The flow of electric charge/charged particles.

Question 2

What is the unit for current?

Answer 2

Ampere, Amp (A); I in equations

Question 3

What is the unit for charge?

Answer 3

Coulomb (C); Q in equations

Question 4

What is the unit for energy?

Answer 4

Joule (J); E in equations

Question 5

What is the unit for resistance?

Answer 5

Ohm (Ω); R in equations

Question 6

What is the main unit for time?

Answer 6

Second (s); t in equations

Question 7

What is the unit for potential difference?

Answer 7

Volt (V); V in equations

Question 8

What is the unit of power?

Answer 8

Yes 💀 (Burke reference)

Watt (W); P in equations

Question 9

What is the equation that links power, current and voltage?

Answer 9

P = I x V (PIV)
power = current x voltage

Question 10

What is the equation that links energy transferred, potential difference, current and time?

Answer 10

E = V x I x t (EVIT)
energy transferred = voltage x current x time

Question 11

What type of electricity do mains supply?

Answer 11

A.C (alternating current)

Question 12

What type of electricity do batteries supply?

Answer 12

D.C (direct current)

Question 13

What is the difference between D.C and A.C current?

Answer 13

In D.C, the voltage is always constant, and the electricity flows in a certain direction. In A.C, the voltage changes from positive to negative and from negative to positive, and so does the direction of the current

Question 14

What is the relationship between light and resistance in an LDR (light-dependent resistor)?

Answer 14

As light increases, the resistance decreases.

Question 15

What is the relationship between temperature and resistance in a thermistor?

Answer 15

As temperature increases, the resistance decreases.

Question 16

What happens to current as you increase the resistance in a circuit?

Answer 16

As the resistance increases, the current decreases, provided all other factors are kept constant.

Question 17

How do you use lamps and LEDs to find out the presence of current in a circuit?

Answer 17

If it lights up, there must be a current in the circuit. If it doesn’t emit light, there isn’t any current.

Question 18

What is current?

Answer 18

The rate of flow of charge.

Question 19

What is the relationship between potential difference, current and resistance.

Answer 19

V = I x R (VIR)
potential different = current x resistance

Question 20

What is the relationship between charge, current and time?

Answer 20

Q = I x t (QIT)
charge = current x time

Question 21

What is current in solid metal conductors?

Answer 21

A flow of negatively charged electrons.

Question 22

What happens to current in a parallel circuit?

Answer 22

The current is shared between each component connected in parallel. The total amount of current flowing into the junction, or split, is equal to the total current flowing out.

Question 23

What happens to voltage in a parallel circuit?

Answer 23

The voltage across each of the components is the same.

Question 24

What is voltage?

Answer 24

The energy transferred per unit charge passed

Question 25

What is a volt?

Answer 25

A joule per coulomb.

Question 26

What is the relationship between energy transferred, charge and potential difference?

Answer 26

V = E/Q (VEQ)
potential difference = energy transferred / charge