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SCIENCE OLYMPIAD - Circuit Wizardry - Circuits (concepts, standards units of measurement, Ohm's law)
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Terms in this set (16)
Components of an electric circuit
Source / battery
Wires
Bulb(s)
Switch
Other components (i.e. resistors, motor, etc.)
Circuit tester
A circuit that can help distinguish electrical conductors from electrical insulators.
Ex: battery, wires and bulb (connect with different materials to test them)
Electric current
The flow of electric charge (electricity) through a material.
Direct current (DC)
A type of current that only flows in one direction (unlike AC which periodically reverses direction).
Voltage
The name for the electric force that causes electrons to flow. It's the measure of potential difference between two points in the circuit.
Voltage may come from a battery or a power plant (energy source).
Resistance
____________ is a measure of how the flow of electric current is opposed or "resisted."
Series circuit
A_______ _______ is a circuit where there is only one path for electrons to follow, from the source through all of the components and back to the source.
If you turn off any electrical device in a _______ circuit, you will turn them all off. If you turn that device back on, you will turn on all the other devices.
In a ______ ________ the current through each of the components is the same
AND
The voltage across the circuit is the sum of the voltages across each component.
Parallel circuit
A ___________ is a circuit where the electrons have more than one path to follow.
If you turn off one electrical device in a _______ _______, you will NOT turn them all off.
In a ________ _______ circuit, the voltage across each of the components is the same
AND
the total current is the sum of the currents through each component.
Volt
Unit of measurement for voltage (V)
Ampere
Unit of measurement for electrical current (A or amp)
Ohm
Unit of measurement for resistance
(often represented by the omega symbol: Ω)
Voltmeter
The tool for measuring the voltage (volts) in an electric circuit.
Ammeter
The tool for measuring the current in a circuit.
Ohmmeter
The tool for measuring the resistance in an electric circuit.
Multimeter
A ________ can measure several functions including voltage, current, resistance, and temperature.
Ohm's law
___________ states that the current passing through a conductor is proportional to the voltage over the resistance.
I = V / R or V = I x R or I = V / R
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