Electrical circuits and ohms law Flashcards

1
Q

Define circuit

A

complete path from the battery to the load and back to the battery.

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2
Q

define continuity

A

a complete circuit without breaks

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3
Q

will a load operate with an open circuit

A

no. an open circuit is an incomplete path and therefore there is no current flow.

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4
Q

short to power

A

when the power side of one circuit connects to the power side of another circuit. 1)the circut will not work. 2) a fuse may be blown

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5
Q

short to ground

A

when the power side of on circuit connects to the ground side of another circut, often without a load between them. 1) the circuit will not work. 2) a fuse is more likely to be blown than in a short to power situation. 3) wires are potentially melted.

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6
Q

water wheel analogy

A

current is constant throughout a circut. if 200amps are measured after the power source and before the load, 200 amps will also be measured after the load.

voltage is not constant throughout the circuit. voltage will drop after the load.

12ft of potential energy (voltage) at the top of th wheel
0ft of potential energy at the bottom of the wheel

same amount of water gets to the pond regardless of voltage.

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7
Q

ohms law volts

A
Volts = Current * Resistance 
Current = Volts/Resistance 
Resistance = Volts/Current
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8
Q

watts law

A

Power = Amps * Volts

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9
Q

Ohms law, what is I?

A

amps

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10
Q

Ohms law, what is E?

A

volts

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11
Q

Ohms law, what is R?

A

resistance

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12
Q

What is included in a complete electrical circuit?

A

power, load, ground, complete path between three elements.

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13
Q

what is the difference between a short to voltage and a short to ground?

A

a short to voltage is the power side of one circuit connecting to the power side of another circuit. Power-Power. a short to ground is the power side of one circuit connecting to the ground side of another circuit. Power-Ground. a short to ground is what catches shit on fire.

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14
Q

If 12 volts are applied to a resistance of 3 ohms what will the amperage of the circuit be?

A

amps = voltage/resistance
4= 12/3
therefore you would need a 4 amp fuse for this circuit.

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15
Q

How many watts are consumed by a light bulb if 1.2 amps are measured when 12v are applied?

A

Power = amps x volts
power = 1.2 x 12
14.4 watts

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16
Q

how many watts are consumed by a starter motor if it draws 150 amps at 10v

A

pwr = amps x volts
pwr = 150 x 10
1500 watts

17
Q

1hp = x watts?

A

about 750

18
Q

if the voltage in a circuit increase while the resistance remains the same, what happens to the current?

A

amps = voltage/resistance

current increases

19
Q

if 200 amps flow to the starter motor from the bat+. how many amps will return to bat-

A

200 amps

20
Q

what circuit failure is most likely to cause a fuse to blow

A

short to ground

21
Q

ohms law solve for current

A

Current = Volts/Resistance

22
Q

ohms law solve for resistance

A

Resistance = Volts/Current