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Electrical Holy Shit > Chapter 23 part 2 > Flashcards

Chapter 23 part 2 Flashcards

1
Q

Is produced when voltage is applied to a load and current flows through the load.

A

Power

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2
Q

The ____ the load’s resistance or higher the applied voltage, the ___ power produced.

A

lower, more

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3
Q

The ____ the load’s resistance or lower the applied voltage, the ___ power produced.

A

higher, less

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4
Q

The amount of power produced is measured in ___.

A

Watts(W)

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5
Q

The amount of power produced by a load is equal to the voltage drop across the load times the ___________.

A

current through the load

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6
Q

What equation is used to calculate total power in a series circuit?

A

PT = P1 + P2 + P3

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7
Q

What is the total power in a series circuit if three loads are connected in series and each load produces 2W?

A 
PT = P1 + P2 + P3 
PT = 2 + 2+ 2
PT = 6W
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8
Q

What is the current in the circuit of a coffee maker during brewing when the applied voltage is 120V and the brew heating element resistance is 16Q?

A 
I = E / R
I = 120 / 16 
I = 7.5 A
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9
Q

What is the power in a coffee maker’s circuit during brewing when the applied voltage is 120 V and the circuit current is 7.5 A?

A 
P = E x I 
P = 120 x 7.5
P = 900 W
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10
Q

A coffee pot is warming and we need to find the total resistance. The resistances are 224 Q and 16 Q?

A 
RT = R1 + R2 
RT = 224 + 16
RT = 240 Q
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11
Q

What is the current in the circuit during warming when the applied voltage is 120 V and the total circuit resistance is 240 Q ?

A 
I = E / R 
I = 120 / 240 
I = 0.5
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12
Q

What is the power in the circuit during warming when the applied voltage is 120V and the circuit current is 0.5A?

A 
P = E x I 
P = 120 x 0.5
P = 60 W
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13
Q

Has two or more components connected so that there is more than on path for current to flow.

A

Parallel connection

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14
Q

Why must care be take when working on parallel circuits?

A

Care must be taken when working with parallel circuits because current can be flowing in one part of the circuit even though another part of the circuit is turned off.

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15
Q

At least how many switches must be closed to start current flow in a parallel circuit?

A

One or more switches must be closed

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16
Q

In a parallel circuit how many switches must be opened to stop current flow?

A

All switches must be opened

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17
Q

Why are switches normally connected in parallel?

A

to provide additional turn-on points

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18
Q

What is an example of a turn-on switch?

A

A doorbell. There are switches at the back, front, and side door.

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19
Q

Manually operated switches are often connected in parallel with mechanical and automatic switches. What is an example of this?

A

The dome light in a car is automatically turned on when the door is opened and automatically turned off when the door is closed. A manual switch (usually built into the headlight switch) is connected in parallel with the door limit switch so that the dome light can be manually turned on.

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20
Q

What is the opposition to current flow?

A

resistance

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21
Q

The total resistance in a circuit containing parallel-connected loads is _____ than the smallest _________.

A

less

smallest resistance value

22
Q

The total resistance _____ if loads are added in parallel and _____ if load are removed.

A

decreases

increases

23
Q

What equation is used to calculate total resistance in a parallel circuit containing two resistors?

A

RT = R1 x R2 / R1 + R2

24
Q

What is the total resistance in a circuit containing resistors of 300 Q and 600 Q connected in parallel?

A 
RT = R1 x R2 / R1 + R2 
RT = 300 x 600 / 300 + 600 
RT = 180,000 / 900 
RT = 200 Q
25
Q

What equation is used to calculate total resistance in a parallel circuit with three or more resistors?

A

RT = 1 / 1/R1 + 1/R2 + 1/R3

26
Q

What is the total resistance in a circuit containing three resistors of 5000 Q, 2000 Q and 10,000 Q connected in parallel?

A 
RT = 1 / 1/R1 + 1/R2 + 1/R3
RT = 1 / 1/5,000 + 1/2,000 + 1/10,000
RT = 1/.0002 + .0005 + .0001 
RT = 1250 Q
27
Q

The voltage across each load is the same when loads are connected in parallel. The voltage across each load _________ if parallel loads are added or removed.

A

remains the same

28
Q

What is the most common method used to connect loads?

A

Connecting them in parallel

29
Q

What formula is used to calculate total voltage in a parallel circuit?

A

ET = E1 = E2 = E3 …….

30
Q

What is the total voltage if the voltage across each load is measured at 112 VAC with a voltmeter?

A 
ET = E1 =E2
ET = 112 =112
ET = 112 VAC
31
Q

Total current in a circuit containing parallel connected loads equals the _______.

A

sum of the current through all the loads

32
Q

What happens to total current in parallel circuits if loads are added and what happens if loads are taken away?

A

Total current increases if loads are added and decreases if loads are taken away.

33
Q

What equation should be used to calculate total current in parallel circuits?

A

IT = I1 + I2 + I3 + …….

34
Q

What is the total current in a circuit containing four loads connected in parallel if the current through the four loads is 0.833A, 6.25 A, 8.33 A, and 1.2 A.

A 
IT = I1 + I2 + I3 + I4
IT = 0.833 + 6.25 + 8.33 + 1.2
IT = 16.613 A
35
Q

What does a loose connection do to circuit resistance and circuit current?

A

A loose connection increases the circuit resistance and decreases circuit current.

36
Q

The greater the current flow the ___ the required wire size.

A

larger

37
Q

The lesser the current flow, the ___ the required wire size.

A

smaller

38
Q

When troubleshooting a circuit, an overloaded circuit has a ___ than normal current reading.

A

higher

39
Q

A circuit with a lower-than-expected current reading may have_______.

A

a loose connection

40
Q

What does a loose connection do to circuit resistance and circuit current?

A

A loose connection increases the circuit resistance and decreases the circuit current.

41
Q

How is power produced in parallel circuits?

A

Voltage is applied to a load and current flows through the load.

42
Q

The lower the load’s resistance or higher the applied voltage, ________.

A

the more power produced

43
Q

The higher the load’s resistance or the lower the applied voltage______.

A

the less power produced

44
Q

Power produced by a load is equal to the voltage drop across the load times _________.

A

the current through the load

45
Q

What is total power equal to?

A

Total power is equal to the sum of the power produced by each load.

46
Q

What equation is used to calculate total power in a parallel circuit?

A

PT = P1 + P2 + P3 + P4

47
Q

What is the total circuit power if four loads are connected in parallel and the loads produce 100 W, 750 W, 1000 W, and 150W?

A 
PT = P1 + P2 + P3 + P4 
PT = 100 + 750 + 1000 + 150
PT = 2000 W
48
Q

Explain how a waffle iron heating using a parallel circuit.

A

The waffle iron includes a heating element that heats the upper section and a heating element that heats the lower section The two heating elements are connected in parallel. An ON/OFF temperature control switch is used to turn ON the heating elements and control the temperature. A temperature switch is wired in series with the ON/OFF temperature control switch to turn power OFF if over-heating occurs in the circuit.

49
Q

What is the total power in the waffle iron circuit containing two heating elements with power ratings of 750 W?

A 
PT = P1 + P2
PT = 750 + 750 
PT = 1500W
50
Q

What is the total current in the waffle iron if the total power is 1500 W and the total voltage is 120 V?

A 
IT = P/E
IT = 1500/120
IT = 12.5 A
51
Q

What is the total resistance of the waffle iron if the total voltage is 120 V and the total current I 12.5 A?

A 
RT = E/T 
RT = 120/12.5 
RT = 9.6 Q

Electrical Holy Shit (13 decks)

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