Electrical circuits and ohms law

Question 1

Define circuit

Answer 1

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

Question 2

define continuity

Answer 2

a complete circuit without breaks

Question 3

will a load operate with an open circuit

Answer 3

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

Question 4

short to power

Answer 4

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

Question 5

short to ground

Answer 5

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.

Question 6

water wheel analogy

Answer 6

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.

Question 7

ohms law volts

Answer 7

Volts = Current * Resistance 
Current = Volts/Resistance 
Resistance = Volts/Current

Question 8

watts law

Answer 8

Power = Amps * Volts

Question 9

Ohms law, what is I?

Answer 9

amps

Question 10

Ohms law, what is E?

Answer 10

volts

Question 11

Ohms law, what is R?

Answer 11

resistance

Question 12

What is included in a complete electrical circuit?

Answer 12

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

Question 13

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

Answer 13

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.

Question 14

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

Answer 14

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

Question 15

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

Answer 15

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

Question 16

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

Answer 16

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

Question 17

1hp = x watts?

Answer 17

about 750

Question 18

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

Answer 18

amps = voltage/resistance

current increases

Question 19

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

Answer 19

200 amps

Question 20

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

Answer 20

short to ground

Question 21

ohms law solve for current

Answer 21

Current = Volts/Resistance

Question 22

ohms law solve for resistance

Answer 22

Resistance = Volts/Current