E_E_T_I_I_Y 1.M K S J L 2.C L R C T 3.Y L J D F 4.D Q V Y K.

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

17%

0%

17%

67%1. M K S J L

2. C L R C T

3. Y L J D F

4. D Q V Y K

Energy transformation for an electric fire is:

0%

0%

100%

0%

1. Electrical to light

2. Electrical to heat

3. Heat to electrical

4. Electrical to sound

Energy transformation for a vacuum cleaner is:

0%

0%

100%

0%


2. Electrical to kinetic

3. Heat to electrical


Which power rating is incorrect?

13%

50%

25%

13%

Kettle – 200W Light bulb – 60 to a 100W

Television – 150W Cooker – 12000W

1. Kettle – 200W

2. Light bulb – 60 to a 100W

3. Television – 150W

4. Cooker – 12000W

The colour for the Live wire in a plug is

Blu

e

Bro

wn

Yel

low/g

reen

Purp

le

12%

0%6%

82%1. Blue

2. Brown

3. Yellow/green

4. Purple

The colour for the Earth wire in a plug is

Blu

e

Bro

wn

Yel

low/g

reen

Purp

le

6%0%

88%

6%

1. Blue

2. Brown

3. Yellow/green

4. Purple

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

27%

9%

9%

55%

3A 5A 7A 13A

1. 3A

2. 5A

3. 7A

4. 13A

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

0%

25%

0%

75%

3A 5A 7A 13A

1. 3A

2. 5A

3. 7A

4. 13A

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

80%

20%

True False

1. True

2. False

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

73%

27%

True False

1. True

2. False

The correct flex must be used with an appliance to …

60%13%

27%

Carry the current without overheating

Match colours with the appliance

Restrict the flow of current

1. Carry the current without overheating

2. Match colours with the appliance

3. Restrict the flow of current

An appliance with a higher power rating needs a …

0%

88%

0%

13%

1. Thinner flex

2. Shorter flex

3. Thicker flex

4. Longer flex

This symbol means

94%

0%

6%

0%

1. Appliance is fire proof

2. Appiance needs a thick flex

3. Appliance can be used under water

4. Appliance is double insulated

This symbol means

25%

75%

0%1. 3 core flex is used

2. 2 core flex is used

3. No flex is used

Which statement is true?

Mai

ns su

pply

is d

.c. .

..

Mai

ns su

pply

is a

.c. .

..

Mai

ns su

pply

is d

.c. .

..

Mai

ns su

pply

is a

.c. .

..

7%

57%

21%14%

1. Mains supply is d.c. and battery supply is d.c.

2. Mains supply is a.c. and battery supply is a.c

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

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

The mains voltage is

240

V 2

30V

320

V 3

40V

7% 7%0%

87%1. 240V

2. 230V

3. 320V

4. 340V

The mains frequency is

40H

z

50H

z

40k

Hz

50M

hz

19%

0%6%

75%1. 40Hz

2. 50Hz

3. 40kHz

4. 50Mhz

Alternating current (a.c.)

14%

79%

7% 0%

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)

1. Changes direction sometimes.

2. Changes direction many times a second

3. Is always in the same direction (positive to negative)

4. Is always in the same direction (negative to positive)

Direct current (d.c.)

6% 6%13%

75%

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)

1. Changes direction sometimes.

2. Changes direction many times a second

3. Is always in the same direction (positive to negative)

4. Is always in the same direction (negative to positive)

Charge has the symbol ___ and is measured in _____.

12%

0%

6%

82%

C and Amps Q and Amps

C and Coulombs Q and Coulombs

1. C and Amps

2. Q and Amps

3. C and Coulombs

4. Q and Coulombs

Charge, current and time are related by the equation:

88%

13%0%

0%

Q = I x t I = Q x t t = I x Q Q = I2 x t

1. Q = I x t

2. I = Q x t

3. t = I x Q

4. Q = I2 x t

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

50%50%

True False

1. True

2. False

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

300

0V 1

20A

300

0A 2A

0%

31%

19%

50%1. 3000V

2. 120A

3. 3000A

4. 2A

Current is measured using

6%

0%

0%

94%

1. Ammeter

2. Voltmeter

3. Ohmmeter

4. Stop watch

A voltmeter is always placed in parallel

8%

92% 1. True

2. False

An ammeter is always placed in parallel

88%

13% 1. True

2. False

Ohms laws is

0%0%

100%

0%

R = V x I I = V x R V = I x R P = I2 x R

1. R = V x I

2. I = V x R

3. V = I x R

4. P = I2 x R

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

0%

25%

63%

13%

23A 230A 2.3mA 230mA

1. 23A

2. 230A

3. 2.3mA

4. 230mA

Energy has the symbol E and is measured in ___

0%

0%

0%

100%

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

1. Watts (W)

2. Amps (A)

3. Coulombs (C)

4. Joules (J)

Energy is related to Power and time through the equation

7%

0%

60%

33%

1. E = P/t

2. E = Pt

3. E = P2t

4. P = Et

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

8.3

A

480

A 1

20A

0.4

8A

77%

8%0%

15%

1. 8.3A

2. 480A

3. 120A

4. 0.48A

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

13%

38%

50%

0%

P=IR P=IV P=I2R P=I2 V

1. P=IR

2. P=IV

3. P=I2R

4. P=I2 V

The energy change in a filament lamp is

6%19%

75%

0%

Light to electrical Electrical to light

Electrical to heat and light Electrical to heat

1. Light to electrical


3. Electrical to heat and light


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

Gas

Gla

ss

Res

ista

nce w

ire

Imag

inat

ion

44%

0%

56%

0%

1. Gas

2. Glass

3. Resistance wire

4. Imagination

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

Gas

Gla

ss

Res

ista

nce w

ire

Imag

inat

ion

81%

0%6%

13%

1. Gas

2. Glass

3. Resistance wire

4. Imagination

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

20%

27%53%

0%

200mins 1200mins 1200s 75s

1. 200mins

2. 1200mins

3. 1200s

4. 75s

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

7% 0%14%

79%

25W 100W 0.25W 25mW

1. 25W

2. 100W

3. 0.25W

4. 25mW

The current in a series circuit

Is th

e sa

me

thro

ugho..

Is th

e sa

me

thro

ughou...

Is le

ss th

an th

e su

pply

Split

s ac

ross

the

var..

.

35%

0%0%

65%1. Is the same throughout

the circuit if all components are the same

2. Is the same throughout the circuit

3. Is less than the supply

4. Splits across the various components

The current in a parallel circuit

Is th

e sa

me

thro

ugho..

Is th

e sa

me

thro

ughou...

Is le

ss th

an th

e su

pply

Split

s ac

ross

the

var..

.

100%

0%0%0%

1. Is the same throughout the circuit if all components are the same




The voltage in a series circuit

Is th

e sa

me

thro

ugho..

Is th

e sa

me

thro

ughou...

Is le

ss th

an th

e su

pply

Split

s ac

ross

the

var..

.

0%

93%

7%0%

1. Is the same throughout the circuit if all components are the same




The voltage across components in a parallel circuit

Is th

e sa

me

acro

ss e

a..

Can

be

sum

med

to e

...

62%

38%

1. Is the same across each component.

2. Can be summed to equal the supply voltage

Which of the equations below is incorrect for a series circuit

IT =

I1 =

I2

Vs=

V1

+ V2

IT =

I1 +

I2

RT =

R1

+ R2

24%

47%

24%

6%

1. IT = I1 = I2

2. Vs= V1 + V2

3. IT = I1 + I2

4. RT = R1 + R2

Which of the equations below is incorrect for a parallel circuit

IT =

VT

/ RT

Vs=

V1

= V2

IT =

I1 +

I2

RT =

R1

+ R2

7%

79%

7%7%

1. IT = VT / RT

2. Vs= V1 = V2

3. IT = I1 + I2

4. RT = R1 + R2

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

3 O

hm

6 O

hm

10

Ohm

2 O

hm

7%

80%

0%

13%

1. 3 Ohm

2. 6 Ohm

3. 10 Ohm

4. 2 Ohm

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

3 O

hm

6 O

hm

10

Ohm

2 O

hm

0% 0%

100%

0%

1. 3 Ohm

2. 6 Ohm

3. 10 Ohm

4. 2 Ohm

I have a 1 Ohm resistor and I place several other resistors that are higher in value in

parallel. Does the total resistance

Incr

ease

Dec

reas

e

Sta

y th

e sa

me

24%29%

47%1. Increase

2. Decrease

3. Stay the same

Team Scores

3167 Team 3

3067 Team 5

2767 Team 1

2733 Team 4

2683 Team 2

E_E_T_I_I_Y 1.M K S J L 2.C L R C T 3.Y L J D F 4.D Q V Y K.

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Transcript of E_E_T_I_I_Y 1.M K S J L 2.C L R C T 3.Y L J D F 4.D Q V Y K.