P6

Question 1

Power(P) = ?

Answer 1

Voltage(V) x Current(I)

Question 2

R total = R1 +R2
What does R1 represent?

Answer 2

the first resistance in series circuit

Question 3

1/R1 + 1/R2 = ?

Answer 3

1/R total

Question 4

What is the formula for total resistance in a parallel circuit?

Answer 4

1/R total = 1/R1 + 1/R2

Question 5

Resistance formula

Answer 5

R=V/I

Question 6

What is the Ohm’s Law formula?

Answer 6

R=V/I

Question 7

I=Q/t
What does Q represent in this formula?

Answer 7

Q = charge

Question 8

What is the formula for power?

Answer 8

Power = energy transferred/time x voltage x current

Question 9

Energy transferred electrically =

Answer 9

IVt

Question 10

What does p.d. stand for?

Answer 10

Potential Difference

Question 11

Define a series circuit

Answer 11

Only one way round the circuit

Question 12

Define a parallel circuit

Answer 12

Two or more components attached along separate branches of the circuit

Question 13

As more light bulbs are added in series, the current __________.

Answer 13

decreases

Question 14

As more light bulbs are added in series, the potential difference(voltage) across each bulb _________.

Answer 14

decreases

Question 15

Current is the _____ everywhere in a series circuit.

Answer 15

same

Question 16

The voltage in a series is _____ amongst the different components.

Answer 16

split

Question 17

In a parallel circuit, _____ in each branch is the same as the power supply.

Answer 17

p.d.

Question 18

In a parallel circuit, _____ splits as it goes into ________ branches.

Answer 18

current, different

Question 19

What happens to the temperature of a thermistor as the resistance increases?

Answer 19

Temperature also increases

Question 20

What is the relationship between light intensity and LDR resistance?

Answer 20

As light increases, LDR resistance decreases.

Question 21

What is the symbol for ohm(unit for electrical resistance)?

Answer 21

Ω

Question 22

What kind of appliances draw the biggest currents?

Answer 22

Things that use heat tend to draw bigger currents.

Question 23

Name the 3 main dangers of electricity

Answer 23

• Damaged insulation
• Overheating of wires
• Damp conditions

Question 24

Damaged insulation

Answer 24

Exposed wires can cause electric shots if we touch them accidentally.

Question 25

Overheating of wires

Answer 25

e.g. too many appliances plugged into the same extension cord
-> can cause overheating + potential fire hazard

Question 26

Damp conditions

Answer 26

Water can conduct electricity and many cause electric shocks, if splashed onto exposed wires.