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Basic of Electricity
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- 1Basics of ElectricityAtoms
○ Made of protons, electrons and neutrons
○ Nucleus is the central - contains protons/neutrons and electrons revolve around the orbit
○ Electric charges can be positive or negative, opposite charges attract, like charges repel
- 2Basic Units of Electricity ○ Voltage: V ○ Current: I ○ Resistance: R ○ The flow of electrons is called electricity; electrons hold a positive chargeVoltage
○ Voltage can be described as electrical pressure applied by the pressure from a battery
○ The amount of pressure applied is measured in volts known as electromotive force (symbol = E )
○ Measuring instrument: Voltmeter
- 3Current ○ Rate of electron flow measured in amperes (A) ○ Increases as voltage increases provided circuit resistance remains constant ○ Measuring instrument: AmmeterAmmeter
○ Measures quantity of current flow
○ Placed in series (inline) to count electrons passing through it
- 4Resistance ○ Force reduces flow of electrons (opposing voltage) ○ Higher resistance decreases flow of electrons; lower resistance allows more to flow ○ Unit: Ohm Ω ○ Measuring instrument: OhmmeterOhmmeter
○ Measures the resistance of electrical component
○ Finds the resistance by Ohm's law (V = I x R)
○ Different types of meters available with different sensitivity levels.
○ Ohmmeter is used in bonding contact applications
- 5Ohm's Law ○ States that the voltage across a resistor is directly proportional to the current flowing through the resistanceMulti-Meter
○ Combines several measurement functions in one unit
○ Used for checking voltage, current and resistance/continuity
○ Analog multimeters use a microammeter with a moving pointer to display readings
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- Fichas sobre Basic of Electricity, creado por Rachel Harper el 14/04/2020.
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- Rachel Harper
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