Measure Voltage, Current, Resistance, and Continunity Flashcards
Which law of electricity is the most important for an aircraft to know?
Ohms law
What are the elements of Ohm’s law?
Voltage E, current I, and resistance R (volts, AMPS, and ohms).
What is voltage?
Electrical pressure.
What is the basic unit of voltage?
The voltage.
What instrument is used to measure voltage?
A voltmeter.
To measure voltage, is a voltmeter placed in series or in parallel with the source of voltage?
In parallel.
What is electrical current?
The flow of electrons in a circuit.
What is the basic unit of current flow?
The ampere (amp)
What part of an amp is a milliamp?
One thousandth (0.001) of an amp.
What instrument is used to measure current flow?
An ammeter.
What two things happen when current flows through a conductor?
Heat is generated and a magnetic field surrounds the conductor.
To measure current through a component, is an ammeter placed in parallel or in series with the component?
In series.
What is meant by resistance in an electrical circuit?
The opposition to the flow of electrons.
What is the basic unit of electrical resistance?
The ohm.
What is a megohm?
One million (1,000,000) ohms.
What four things affect the resistance of an electrical conductor?
The material, the cross-sectional area, the length, and the temperature.
What instrument is used to measure electrical resistance?
An ohmeter.
How can you tell the resistance of a composition resistor?
By a series of colored bands around one end of the resistor.
What is meant by continuity in an electrical circuit?
The circuit is continuous (or complete) when electrons can flow from one terminal of the power source to the other.
What instrument is used to measure continuity in an electrical circuit?
An ohmeter.
When measuring resistance of a component with an ohmeter, should the circuit be energized?
No, there should be no power on the circuit.
