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