Flashcards in 10 Deck (41)
What is a thing called which doesn’t carry a electrical current through it?
What is a thing called which electrical currents can flow through?
What is the sign for a ammeter?
A circle with an A in it.
What is the sign for a voltage metre?
A circle with a V in it.
What is the sign for a filament lamp?
A circle with a X in it.
What is the sign for a motor?
A circle with a M in it.
What is the sign of a resistor?
What is the sign of a variable resistor?
A oblong with a arrow crossing through it, (bottom left to top right)
What is the sign for a thermistor?
A oblong with a bendy line going through it (bottom left to top right.)
What is the sign for light dependent resistor?
A oblong with a circle round it.
What is the sign for a diode?
A circle with a triangle in it (triangle like a ‘not’ logic gate)
What is the sign for an LED.
Same as diode ( circle with a triangle in it) with 2 arrows going out of it, in the top right direction.
What is a series circuit like?
One single loop with all components on one circuit.
What is a parallel circuit like?
Many different circuits in one loop.
Ads and disads of series circuit?
- the more bulbs the lower brightness. As all bulbs share the amps.
- one single point of Failure.
Ads and disads of parallel circuit:
- if one loop failed then others can still work.
- all stay as bright as each other.
- but drains battery and is therefore costly.
What 3 thing must circuits have?
What is electrical current?
- known as letter ‘i’
- its the rate of flow of charge.
- or charge per second.
- measured in amps (A)
What is potential difference?
- its energy per unit of charge.
- measured in volts (V)
What is Kirchhoff’s first law?
The total energy entering a junction is equal to the energy leaving the junction.
What is electrical resistance?
An opposition to the flow of the circuit.
Charge / time.
,i = Q/T
Energy / charge.
What is one volt?
1 joule per coulomb.
What is resistance measured in?
Ohms, (omega sign)
The higher the resistance?
The lower the current.
How does resistance occur?
When positive ions block and hit into moving electrons stopping the flow of current.
The hotter the wire?
The more resistance.
Resistor on a (current-voltage) graph?
A directionally proportion graph, through origin.