Unit 3: Electricity Flashcards
(29 cards)
What is voltage like in a series circuit?
Combines to give the supply voltage.
What is current like in a series circuit?
Same at all points.
What is voltage like in a parallel circuit?
Same at all points.
What is current like in a parallel circuit?
Combines to give the current from the supply.
What is capacitance?
The ratio of charge to voltage for a capacitor; number of coulombs a capacitor can store per volt.
What is a capacitor?
An electric device that can store charge and energy in a DC circuit.
What is current?
A flow of charge (or electrons)
What is the electromotive force?
Number of joules of electrical energy given to each coulomb that passes through the source.
What is the frequency?
Number of times something occurs per second; i.e number of complete A.C cycles per second.
What is the ideal supply?
Supply that has no internal resistance.
What is internal resistance?
Resistant of the material that makes up the cell.
What are lost volts?
Potential difference across the internal resistance.
What is an open circuit?
A circuit in which no current is drawn.
What is Ohm’s law?
Potential difference across a component is proportional to the current flowing through it.
What is peak
Maximum current or voltage.
What is potential difference?
The voltage; the work done when one coulomb moves between these points.
What is r.m.s?
Root mean square; r.m.s A.C voltage is equivalent to the D.C voltage.
What is a short circuit?
Path with zero electrical resistance.
What is the terminal potential difference?
Voltage measured across the terminal of a power supply.
What is voltage?
Another name for potential difference.
What is the conduction band?
The band that allows conduction to take lace; in conductors this band is partly filled.
What is a conductor?
A material that allows electricity to flow.
What is an insulator?
A material that blocks electricity flow.
What is an LED?
Light emitting diode. Semiconductor device that gives out photons when current passes through it.
