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Circuit Types and Ohm's Law
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If voltage rises what a happens to current?
 
Current goes up
 
Current goes down
 
Nothing
If voltage drops what happens to current?
 
Current goes down
 
Current goes up
 
Nothing
If resistance rises what happens to current?
 
Current goes down
 
Current goes up
 
Nothing
If resistance drops what happens to current?
 
Current goes up
 
Current goes down
 
Nothing
The ____________________________ is the unit of measurement for electric power.
Watt
True or False? Most automotive electrical problems are casued by a change in circuit resistance.
True
Why does the automotive industry use one-wire or frame ground circuits?
to limit the amount of wires need to complete the circuit
I represents _______________________.
 
Current
 
Voltage
 
Ohms
 
Watts
E represents ______________________.
 
Voltage
 
Current
 
Ohms
 
Watts
R represents ______________________.
 
Ohms
 
Current
 
Voltage
 
Watts
Technician A says current is the same everywhere in a series circuit. Technician B says current is the same in each branch of a parallel circuit. Who is right?
 
A only
 
B only
 
Both
 
Neither
Technician A says a change in circuit resistance will change the amount of current in the circuit. Technician B says a change in circuit voltage will change the amount of current in the circuit. Who is right?
 
Both
 
A only
 
B only
 
Neither
A 12-volt circuit has a resistance of 2 ohms. How much current is in the circuit?
 
6 amps
 
4 amps
 
5 amps
 
8 amps
True or False? An ammeter is a device that measures resistance of a circuit.
False
Which of the following is not a common type of electric circuit?
 
Series-ground circuit.
 
Series Circuit
 
Parallel Circuit
 
Series- Parallel Circuit
Technician A says a series circuit has only one path for current. Technician B says a series circuit can have only one load. Who is right?
 
A only.
 
B only
 
Both
 
Neither
When a switch is ________________________, current cannot flow through it.
open
Calculate the total resistance and current for the following circuit.
Rt = 10 + 3 + 7 + 2 = 22Ohms, It = 12.6V  22Ω = 0.57A
True or false? Most automotive electrical problems are caused by a change in circuit resistance.
True
In which type of circuit can you find total resistance by adding all of the individual resistances?
Series
What does DVOM stand for?
Digital Volt Ohm Meter
If a circuit has a current of 3 A and a resistance of 5 Ω, how much voltage is applied to the circuit?
15 V
If resistance increases in a circuit, what will happen to current?
Current will decrease.
Write the formulas that express the relationships between voltage, current, and resistance in a circuit.
E = I × R, I = E ÷ R, R = E ÷ I
Why are many automotive circuits frame-ground circuits?
Using the vehicle frame for ground saves wiring because a return wire does not have to be used to carry current back to the power source.
In a one-wire circuit, the vehicle's _____ serves as a large conductor to carry current.
frame
What is a series-parallel circuit?
A series-parallel circuit is a circuit in which some components are wired in series, but others are wired in parallel.
In what way is a parallel circuit different from a series circuit?
A parallel circuit has more than one path for current flow. A series circuit has only one path for current flow.


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