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City & Guilds 2365 Lvl2 > Unit 202 > Flashcards

Unit 202 Flashcards

0
Q

I relates to what?

A

Current in Amperes

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1
Q

Q relates to what?

A

Charge transferred in Coulombs.

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2
Q

t relates to what?

A

Time in seconds

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3
Q

What is the formula…

Q=It, or I=Q/t

A

Q=It
How many Coulombs per time period (t) at a particular current (I)

I=Qt
What current is produces when an amount of Coulombs move through a conductor in a specified amount of time (t)

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4
Q

What is a Coulomb?

A

1 coulomb is 6.7 times 10 to the power of 18 electrons moving through a conductor.

1A is equal to 1Q per second.

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5
Q

How many Coulombs if there is a charge of 3A over 32 seconds.

A

Q=It

I = 3
T=32

3x32=96C

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6
Q

What charge is produced by 834 Coulombs in 2 minutes?

A

I=Q/t

Q=834
t=120

834/120=41.7A

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7
Q

What is the definition of EMF (Electro Motive Force)

A

The number of Joules (J) of work require to move 1 C of electricity around a circuit.

This unit inis referred to as a Volt (V)

1V = 1 Joule/ 1 Coulomb

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8
Q

Q=It
W=QxV

If a battery of 12V gives a current of 5A for 10 minutes the amount of energy provided over the 10 minute period is?

A 
W=QxV
Q=It = 5x (10x60)C
Q=3000C
W=QxV = 3000x12
W= 36000 J or 3.6 kJ
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9
Q

What are the three effects of electrical current?

A

Thermal (Heating)
Chemical
Magnetism

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10
Q

What are the quantity and unit symbols for current?

A 
Quantity = I
Unit = A
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11
Q

What are the quantity and unit symbols for length?

A 
Quantity = l (lower case L)
Unit = m
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12
Q

What are the quantity and unit symbols for luminous intensity?

A 
Quantity = I (upper case i)
Unit = cd
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13
Q

What are the quantity and unit symbols for mass?

A 
Quantity = m
Unit = kg
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14
Q

What are the quantity and unit symbols for temperature?

A 
Quantity = T
Unit = K (kelvin)
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15
Q

What are the quantity and unit symbols for time?

A 
Quantity = t
Unit = s (second)
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16
Q

What are the quantity and unit symbols for area?

A 
Quantity = A
Unit = m2 (metres squared)
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17
Q

What are the quantity and unit symbols for capacitance?

A 
Quantity = C
Unit = F (farad)
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18
Q

What are the quantity and unit symbols for charge?

A 
Quantity = Q
Unit = C (coulomb)
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19
Q

What are the quantity and unit symbols for energy (work)?

A 
Quantity = W (watt)
Unit = J (joule)
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20
Q

What are the quantity and unit symbols for force?

A 
Quantity = F
Unit = N (Newton)
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21
Q

What are the quantity and unit symbols for frequency?

A 
Quantity = f
Unit = H (hertz)
22
Q

What are the quantity and unit symbols for impedance?

A

Quantity =Z

Unit = ohm

23
Q

What are the quantity and unit symbols for inductance?

A 
Quantity = L
Unit = H (Henry)
24
Q

What are the quantity and unit symbols for magnetic flux?

A 
Quantity = phi symbol ( like an o with an I through it)
Unit = Wb (weber)
25
Q

What are the quantity and unit symbols for magnetic-flux density?

A

Quantity =B

Unit = T (tesla)

26
Q

What are the quantity and unit symbols for potential difference?

A 
Quantity = V
Unit V (volt)
27
Q

What are the quantity and unit symbols for power?

A 
Quantity = P
Unit = W (watt)
28
Q

What are the quantity and unit symbols for reactance?

A 
Quantity = X
Unit = ohm
29
Q

What are the quantity and unit symbols for resistance?

A 
Quantity = R
Unit = ohm
30
Q

What are the quantity and unit symbols for resistive Ty?

A 
Quantity = rho symbol (p)
Unit = ohm-metre
31
Q

What is the power of 10 used for tera (T)?

A

12

32
Q

What is the power of 10 used for giga (G)?

A

9

33
Q

What is the power of 10 used for mega (M)?

A

6

34
Q

What is the power of 10 used for kilo (k)?

A

3

35
Q

What is the power of 10 used for hecto (h)?

A

2

36
Q

What is the power of 10 used for deka (da)?

A

1

37
Q

What is the power of 10 used for deci (d)?

A

-1

38
Q

What is the power of 10 used for centi (c)?

A

-2

39
Q

What is the power of 10 used for milli (m)?

A

-3

40
Q

What is the power of 10 used for micro (u micro symbol)?

A

-6

41
Q

What is the power of 10 used for nano (n)?

A

-9

42
Q

What is the power of 10 used for pico (p)?

A

-12

43
Q

Sin=?

A

Opposite/hypotenuse

44
Q

Cos=?

A

Adjacent/hypotenuse

45
Q

Tan=?

A

Opposite/adjacent

46
Q

Given Sin0=o/h, if the opposite = 7 and the angle is 35 degrees, what is the length of the hypotenuse?

A

Sin0=o/h
Transpose to h=o/Sin0
h=7/sin35
h= 12.2m

47
Q

Given that Cos0=a/h, if the angle is 50 degrees and the hypotenuse is 18m, what is the length of the adjacent?

A

Cos0=a/h
Transpose… a=cos0 x h
a=cos50 x 18
Adjacent = 11.57m

48
Q

Given that Tan0=o/a, if the adjacent is 20m and the angle is 70 degrees, what is the length of the hypotenuse?

A

Tan0=o/a
Transpose… O=tan0xa
Tan70x20=54.9m

49
Q

The specific resistance of a material is represented by which symbol?

A

rho (p)

50
Q

Given R=p(rho)l/A

Calculate the resistance of 1000m of 16mm squared cable where p (rho) = 0.0172 micro ohms per metre.

A

R=1.075

51
Q

What is the formula to work out resistivity?

A

R=p(rho)l/A

52
Q

Given that R(t1) = R(t2)x(1+a(alpha)T). If the resistance of 100m of 2.5mm squared copper cable 0.5375 ohms at 20 degrees C, and the coefficient for copper at 20 degrees C is 0.00396 ohms, it’s resistance at 50 degrees C is?

A

0.60 ohms

City & Guilds 2365 Lvl2 (1 decks)

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