Electrical circuits and ohms law Flashcards
Define circuit
complete path from the battery to the load and back to the battery.
define continuity
a complete circuit without breaks
will a load operate with an open circuit
no. an open circuit is an incomplete path and therefore there is no current flow.
short to power
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
short to ground
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.
water wheel analogy
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.
ohms law volts
Volts = Current * Resistance Current = Volts/Resistance Resistance = Volts/Current
watts law
Power = Amps * Volts
Ohms law, what is I?
amps
Ohms law, what is E?
volts
Ohms law, what is R?
resistance
What is included in a complete electrical circuit?
power, load, ground, complete path between three elements.
what is the difference between a short to voltage and a short to ground?
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.
If 12 volts are applied to a resistance of 3 ohms what will the amperage of the circuit be?
amps = voltage/resistance
4= 12/3
therefore you would need a 4 amp fuse for this circuit.
How many watts are consumed by a light bulb if 1.2 amps are measured when 12v are applied?
Power = amps x volts
power = 1.2 x 12
14.4 watts