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Auto 15
| Question | Answer |
|---|---|
| Negative | Charge of an electron |
| Positive | Charge of a proton |
| What three things must be present to allow for a continuous flow of electricity? | *An excess of electrons in one place *a lack of electrons in another place *a path between the two places in another place |
| Two power or energy sources used in a automobile's electrical system are... | Chemical reaction and magnetism |
| Induction | The process of producing electricity through magnetism |
| Source of chemical reaction | The battery - the chemical reaction causes a lack of electrons at the positive terminal and an excess at the negative terminal |
| What happens when the chemical reaction in a battery becomes weak? | Either the battery has run out of electrons or all the protons are matched with an electron |
| AC generator | The heart of a vehicles charging system |
| Ampere | Unit for measuring electrical current |
| If an atom looses an electron, what is the atoms charge? | Positive |
| Two types of current | Direct current (DC), alternating current (AC) |
| Direct current | Electrons flow in one direction |
| Alternating current | Electrons change direction at a fixed rate |
| What type of current is used in automobiles? | Most of the components use direct current |
| Conventional Theory | Current flows from positive to negative |
| Electron Theory | Current flows from negative to positive |
| Hole-flow Theory | Current flows in both directions |
| The text teaches that current flows from... | A point of higher potential (voltage) to a point of lower potential (voltage) |
| Voltage | Electrical pressure-the force developed by the attraction of electrons to protons |
| Electromotive force | EMF-pressure that exists between a positive and negative point within an electrical circuit |
| Volts | Unit used to measure electrical pressure - EMF (Electromotive force) |
| One volt | The amount of pressure required to move 1 ampere of current through a resistance of 1 ohm |
| Voltmeter | Instrument used to measure voltage |
| Ohm | Unit used to measure electrical resistance in a wire |
| Ohmmeter | Instrument used to measure electrical resistance |
| Conductor | Has low resistance to electricity allowing electricity to flow through it |
| Insulator | Has high resistance to electricity prevents electricity from flowing through it. |
| Why is AC prefered over DC when powering a motor? | AC does not have a constant value and produces 29% less heat than DC |
| What happens to the current in an electrical circuit when the resistance increases? | The current decreases |
| Closed circuit | Path that connects the positive and negative terminals of the electrical power source is connected |
| Open circuit | Path that connects the positive and negative terminals of the electrical power source is broken |
| How is the amount of current flowing in a circuit determined? | By the resistance in the circuit |
| What is learned when one monitors voltage drop? | How much energy is being consumed by the load |
| Watts | Unit of measure of electrical power |
| Closed | A circuit that allows electricity to flow, nothing blocks its path |
| Open | A circuit that is incomplete |
| Grounding the load | Using the chasis as a conductor for the negative side of the battery through the battery's ground wire |
| Ohm's Law | It takes 1 volt of electrical pressure to push 1 ampere of electrical current through 1 ohm of resistance |
| Voltage drop | Amount of voltage required to cause current flow through a load |
| Impedance | Actual resistance of a load |
| If two loads have the same available voltage, which will use the most power? | The one with the lowest resistance |
| Five basic parts of an automotive circuit | Power source *conductors *loads *controllers *circuit protection devices |
| The resistance of a negative temperature coefficient thermistor increases | As the temperature increases |
| Series Circuit | One or more resistors connected to a voltage source with only one path of electron flow |
| Parallel Circuit | Two or more different paths for the current to flow through |
| Characteristics of Series Circuits | Circuit's current is constant through the circuit *Voltage drops are different if resistors are different *Sum of voltage drop equals the source voltage *Total resistance is equal to sum of all resistance in the circuit |
| Characteristics of Parallel Circuit | Total circuit resistance lower in leg with the lowest total resistance *Current in each leg different if resistance values different *Sum of current on each leg equals total circuit current *Voltage in each leg drops if no load place on parallel circuit |
| Solenoid | An electromagnetic switch with a movable core |
| Primary purpose of a conventional vehicles battery | Provide a starting burst of power to start the engine |
| Electricity | The flow of electrons from one atom to another |
| Watt's Law | P=IxE.......(Power equals current times voltage) |
Created by:
sudokken
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