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Electrical > Test 2 > Flashcards

Test 2 Flashcards

1
Q

What does Ohm’s law state?

A

Current is directly proportional to voltage and inversely proportional to resistance

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2
Q

What is constant, not changing depending on voltage in Ohm’s law?

A

Resistance

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3
Q

Ohm’s Law Formula

A

I=V/R, V=I*R, R=V/I

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4
Q

What happens to the voltage in a parallel circuit?

A

The voltage of the supply is given to each load

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5
Q

What happens to the current in a parallel circuit?

A

All loads add up to the current

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6
Q

What happens to the current in a series circuit?

A

All loads have the total current

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7
Q

What happens to the voltage in a series circuit?

A

All loads add up to the total voltage

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8
Q

Power formula

A

Joules/time, VI, V^2/R, I^2R

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9
Q

What is kW/h (kilowatt-hour)?

A

How many kilowatts are used per hour (1.0 kilowatts per hour is 1.0kw/h, 60w per hour is 0.06kw/h)

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10
Q

Efficiency formula

A

|Power Out/Power In|

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11
Q

What usually causes loss in efficiency?

A

Heat

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12
Q

How to troubleshoot a series circuit with only an ohm meter

A

Narrow down by measuring half of the set over and over again -> If resistance is present, current is flowing, if not, current is not flowing

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13
Q

What is a series circuit?

A

Any electrically conducting pathway with the entire current flowing through each component

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14
Q

What is a parallel circuit?

A

Any electrically conducting pathway with branching paths

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15
Q

Formula for total resistance in series circuit?

A

R_T = R1 + R2 + … + R_x-1+R_x

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16
Q

Formula for total resistance in parallel circuit?

A

1/R_T = 1/R1 + 1/R2 + … + 1/R_x-1 + 1/R_x

17
Q

How do you measure current in a series circuit?

A

Turn off circuit, break circuit, insert mA meter -> positive of meter goes to power supply, negative goes back to circuit

18
Q

When measuring resistance in parallel, what should the reading be?

A

Less than the value of your smallest resistor

19
Q

How do you measure current in a parallel circuit?

A

Turn off power, break one of the resistors out, put positive on broken resistor and negative on unbroken resistor, switch broken resistors for measuring each one

Electrical (2 decks)

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