AUT 242-Chapter 2

4. How many watts are consumed by a light bulb if 1.2 amperes are measured when 12 volts are applied?

(a) 14.4 watts

7. If the voltage increases in a circuit, what happens to the current (amperes) if the resistance remains the same?

(a) Increase

8. If 200 amperes flow from the positive terminal of a battery and operate the starter motor, how many amperes will flow back to the negative terminal of the battery?

(a) cannot be determined

2. If two insulated wires were to melt together where the copper conductors touched each other, the type of failure would be called a(n)

(a) short-to-voltage

9. What is the symbol for voltage used in calculations?

(b) E

10. Which circuit failure is most likely to cause the fuse to blow?

(b) short-to-ground

5. How many watts are consumed by a starter motor if it draws 150 amperes at 10 volts?

(c) 1,500 watts

3. If 12 volts are being applied to a resistance of 3 ohms,

(c) 4 amperes will flow.

6. High resistance in an electrical circuit can cause

(d) Dim lights, slow motor operation and clicking of relays or solenoids.

High resistance

-can be caused by corroded connections or sockets.

Protection

-examples include fuses and circuit breakers.

Open Circuit

-is any circuit that is not complete or that lacks continuity.

Load

-is as an resistance which converts electrical energy into heat, light or motion.

Power path

-is where the current can flow through or from the power source to the resistance.

Ohm's Law

-it requires 1 volt to push 1 ampere through 1 ohm of resistance.

Short-to-voltage

-occurs when the power side of one circuit is electrically connected to the power side of another circuit.

Watt

-unit of electrical power represented by a current of 1 ampere through a circuit with a potential difference of 1 volt.

3. What is the difference between an electrical open and a short?

Electrical open in a circuit breaks the path of current flow. The open can be any break in the power side, load, or ground side of a circuit. Short is a complete circuit in which the current usually bypasses some or all of the resistance in the circuit and it involves the power side of the circuit.

1. What is included in a complete electrical circuit?

Every complete circuit contains the following part: Power source, protection, power path, electrical load and return path (ground)

4. What is Ohm's law?

It requires 1 volt to push 1 ampere through 1 ohm of resistance. This means that if the voltage is doubled, then the number of amperes of current flowing through a circuit will also double if the resistance of the circuit remains the same.

2. What is the difference between a short-to-voltage and a short-to-ground?

Short-to-voltage occurs when the power side of one circuit is electrically connected to the power side of another circuit. Short-to-ground is a type of short circuit that occurs when the current bypasses part of the normal circuit and flows directly to ground

5. What occurs to current flow (amperes) and wattage if the resistance of a circuit is increased because of a corroded connection?

The current flow (amperes) stays the same and the wattages increases.

Watt's law-

a basic law of electricity used to find the power of an electrical circuit expressed in watts.

Continuity

a circuit that is continuous throughout.

Grounded-

a defective component or circuit that is shorted to ground.

1. If an insulated wire rubbed through a part of the insulation and the wire conductor touched the steel body of a vehicle, the type of failure would be called

a(n) (b) short-to-ground

Shorted- short

circuit or cause to short-circuit

Complete circuit

contains the following parts: a power source, protection, power path, electrical load and a return path.

Power source-

example is a vehicle's battery.

Circuit

is a complete path that electrons travel from a power source through a load and back to the power source.

Short-to-ground

is a type of short circuit that occurs when the current bypasses part of the normal circuit and flows directly to ground.

Electrical load

is an electrical component or portion of a circuit that consumes electric power.

Return path (ground)

is the path for the electrical current from the load back to the power source so that there is a complete circuit.