E_E_T_I_I_Y

1
E_E_T_I_I_Y

• M K S J L
• C L R C T
• Y L J D F
• D Q V Y K

2
Energy transformation for an electric fire is

• Electrical to light
• Electrical to heat
• Heat to electrical
• Electrical to sound

3
Energy transformation for a vacuum cleaner is

• Electrical to light
• Electrical to kinetic
• Heat to electrical
• Electrical to heat

4
Which power rating is incorrect?

• Kettle 200W
• Light bulb 60 to a 100W
• Television 150W
• Cooker 12000W

5
The colour for the Live wire in a plug is

• Blue
• Brown
• Yellow/green
• Purple

6
The colour for the Earth wire in a plug is

• Blue
• Brown
• Yellow/green
• Purple

7
For an appliance up to 700W, what is the correct
value of fuse?

• 3A
• 5A
• 7A
• 13A

8
For an appliance greater than 700W, what is the
correct value of fuse?

• 3A
• 5A
• 7A
• 13A

9
The Earth wire is always connected to the top pin
in a plug

• True
• False

10
The Live wire is always connected to the fuse pin
in a plug

• True
• False

11
The correct flex must be used with an appliance
to

• Carry the current without overheating
• Match colours with the appliance
• Restrict the flow of current

12
An appliance with a higher power rating needs a

• Thinner flex
• Shorter flex
• Thicker flex
• Longer flex

13
This symbol means

• Appliance is fire proof
• Appiance needs a thick flex
• Appliance can be used under water
• Appliance is double insulated

14
This symbol means

• 3 core flex is used
• 2 core flex is used
• No flex is used

15
Which statement is true?

• Mains supply is d.c. and battery supply is d.c.
• Mains supply is a.c. and battery supply is a.c
• Mains supply is d.c. and battery supply is a.c
• Mains supply is a.c. and battery supply is d.c

16
The mains voltage is

• 240V
• 230V
• 320V
• 340V

17
The mains frequency is

• 40Hz
• 50Hz
• 40kHz
• 50Mhz

18
Alternating current (a.c.)

• Changes direction sometimes.
• Changes direction many times a second
• Is always in the same direction (positive to
  negative)
• Is always in the same direction (negative to
  positive)

19
Direct current (d.c.)

• Changes direction sometimes.
• Changes direction many times a second
• Is always in the same direction (positive to
  negative)
• Is always in the same direction (negative to
  positive)

20
Charge has the symbol ___ and is measured in
_____.

• C and Amps
• Q and Amps
• C and Coulombs
• Q and Coulombs

21
Charge, current and time are related by the
equation

• Q I x t
• I Q x t
• t I x Q
• Q I2 x t

22
The voltage of a supply is a measure of the
Energy given to the charges in a circuit.

• True
• False

23
What is the current when 600C of charge is
transferred in 5 mins?

• 3000V
• 120A
• 3000A
• 2A

24
Current is measured using

• Ammeter
• Voltmeter
• Ohmmeter
• Stop watch

25
A voltmeter is always placed in parallel

• True
• False

26
An ammeter is always placed in parallel

• True
• False

27
Ohms laws is

• R V x I
• I V x R
• V I x R
• P I2 x R

28
What current can a 230V supply produce in a
1kilohm resistor

• 23A
• 230A
• 2.3mA
• 230mA

29
Energy has the symbol E and is measured in ___

• Watts (W)
• Amps (A)
• Coulombs (C)
• Joules (J)

30
Energy is related to Power and time through the
equation

• E P/t
• E Pt
• E P2t
• P Et

31
What is the current through a 2kW heater
connected to a 240V supply

• 8.3A
• 480A
• 120A
• 0.48A

32
What is the expression that relates Power,
Current and Resistance?

• PIR
• PIV
• PI2R
• PI2 V

33
The energy change in a filament lamp is

• Light to electrical
• Electrical to light
• Electrical to heat and light
• Electrical to heat

34
For a filament lamp, the energy change takes
place in the

• Gas
• Glass
• Resistance wire
• Imagination

35
For a fluorescent tube, the energy change takes
place in the

• Gas
• Glass
• Resistance wire
• Imagination

36
How long does it take for a 2.5kW fire to use
30MJ of energy?

• 200mins
• 1200mins
• 1200s
• 75s

37
What is the power dissipated in a 10ohm resistor
with 50mA through it?

• 25W
• 100W
• 0.25W
• 25mW

38
The current in a series circuit

• Is the same throughout the circuit if all
  components are the same
• Is the same throughout the circuit
• Is less than the supply
• Splits across the various components

39
The current in a parallel circuit

• Is the same throughout the circuit if all
  components are the same
• Is the same throughout the circuit
• Is less than the supply
• Splits across the various components

40
The voltage in a series circuit

• Is the same throughout the circuit if all
  components are the same
• Is the same throughout the circuit
• Is less than the supply
• Splits across the various components

41
The voltage across components in a parallel
circuit

• Is the same across each component.
• Can be summed to equal the supply voltage

42
Which of the equations below is incorrect for a
series circuit

• IT I1 I2
• Vs V1 V2
• IT I1 I2
• RT R1 R2

43
Which of the equations below is incorrect for a
parallel circuit

• IT VT / RT
• Vs V1 V2
• IT I1 I2
• RT R1 R2

44
A 6 Ohm and 3 Ohm resistor are in parallel. What
is their total resistance?

• 3 Ohm
• 6 Ohm
• 10 Ohm
• 2 Ohm

45
A 6 ohm and 4 Ohm resistor are in series. What is
their total resistance?

• 3 Ohm
• 6 Ohm
• 10 Ohm
• 2 Ohm

46
I have a 1 Ohm resistor and I place several other
resistors that are higher in value in parallel.
Does the total resistance

• Increase
• Decrease
• Stay the same

47
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