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ELX > A1 LT8 > Flashcards

A1 LT8 Flashcards

1
Q

What will happen to current if the applied voltage is decreased to half of its previous value?

A

Current will also decrease to half of its previous value.

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2
Q

What is the modified version of scientific notation used in the electrical trade?

A

Engineering notation

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3
Q

To multiply a number by 10^3 in scientific notation, how do you move the decimal point?

A

Three places to the right

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4
Q

How can the relationship between power, voltage, and current be stated mathematically?

A

Power is directly proportional to the square of the voltage and current.

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5
Q

What is the main way to solve electrical circuit problems?

A

By applying Ohm’s and Watt’s laws

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6
Q

What does inversely proportional mean in terms of resistance and current?

A

If the resistance is doubled, the current will decrease to half of its previous value.

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7
Q

In engineering notation, what kind of exponents are used with powers of 10?

A

Multiples of three

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8
Q

How do you express 0.057 mA in terms of A?

A

57 ?A

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9
Q

What is power?

A

Rate of doing work or energy transfer

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10
Q

What is the abbreviation for the power loss in conductors?

A

P = I^2 x R

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11
Q

What does Watt’s law state?

A

Power in a circuit equals the product of the voltage and the current.

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12
Q

What does the kilo represent?

A

10

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13
Q

What is 5600 milliohms expressed in kilohms?

A

0.0056 k?

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14
Q

What does voltage measure?

A

Amount of energy possessed by an electron

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15
Q

What does PR loss refer to?

A

Power loss as I^2 x R

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16
Q

What is Watt’s law?

A

P = E x I

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17
Q

What is the formula provided for power?

A

P = 1R

18
Q

What is the resistance of a baseboard heater connected to a 240 V source producing heat at the rate of 1500 W?

A

38.4

19
Q

At what rate would heat be dissipated if a heater with the same resistance was connected to a 120 V source?

A

375 W

20
Q

What is one of the forms in which Ohm’s law can be expressed?

A

E=I x R

21
Q

How do you convert milliohms to kilohms?

A

Move the decimal point six places to the left

22
Q

What does horsepower refer to?

A

Amount of work the motor delivers on the shaft

23
Q

What is the efficiency of a motor?

A

Ratio of output watts to input watts at rated load

24
Q

What does motor efficiency represent?

A

How much of the input power is converted to useful output power

25
Q

For a 10 HP motor operating at 75% efficiency, how many input watts are drawn by the motor?

A

9947 watts input

26
Q

How to determine the HP a motor is delivering on the shaft if it is drawing 3730 watts at rated load?

A

5 HP

27
Q

What happens to the current in a circuit if the voltage doubles?

A

Current also doubles.

28
Q

What is the formula for voltage?

A

E=I x R

29
Q

What is the formula for resistance?

A

R=E/I

30
Q

What is the formula for current?

A

I=E/R

31
Q

How can Watt’s law be transposed?

A

E=P/I

32
Q

How does the power change when voltage doubles in a circuit?

A

Power also doubles.

33
Q

What other form can Watt’s law be transposed to?

A

P=E x I

34
Q

How can 25,000 volts be written in engineering notation?

A

25 kV

35
Q

What effect does increasing the rate of electron flow have on a resistive device?

A

It becomes warmer due to more collisions and energy transfer.

36
Q

What happens to the power if both the voltage and current double in a circuit?

A

Power increases by four times.

37
Q

How much current would a 200 W light bulb draw from the same 120 V source?

A

1.67 A

38
Q

What is the formula to calculate percent efficiency of a motor?

A

100% efficiency = (output power / input power) x 100

39
Q

How does power change with an increase in current?

A

Increases

40
Q

What is the value of power when resistance is 80 and current is 0.03?

A

= 192 W

ELX (55 decks)

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