Flashcards
Year 9 Electricity
Cards in this deck (29)
- 1What is current?The rate of flow of charge
- 2What is the unit for current?Amperes
A - 3What equation links charge, current and time?Q=It
or
I=Q/t
or
t=Q/I - 4What is charge?A property of matter that can be positive or negative.
- 5What is the unit of charge?Coulombs
C - 6The flow of current in metals is due to which particles moving?electrons
- 7What is voltage? (sometimes called potential difference)The energy transferred per unit charge
or
The energy transferred by one Coulomb of charge - 8What do LEDs do if a current flows through them?They light up
- 9What does LED stand for?Light Emitting Diode
- 10In a parallel circuit, how does current behave at junctions?It splits, but the total current flowing into the junction is always equal to the current flowing out.
- 11In a series circuit, how does current behave?It is the same all the way round the circuit
- 12What is voltage (or potential difference) measured in?Volts
V - 13What is resistance?A measure of how difficult it is to get a current to flow through a component.
or
The Voltage required to push a current of one Ampere through a component. - 14What equation relates voltage, current and resistance?V = I R
or
I=V/R
or
R=V/I - 15What does a variable resistor do in a series circuit?Its resistance can be changed to make the current larger or smaller.
- 16What does a variable resistor do to current in a parallel circuit?Its resistance can be changed to make the current in its branch larger or smaller.
It does not affect the current in the other branches though. - 17What is an ohmic conductor?A material for which the current and voltage are directly proportional, as long as its physical conditions (temperature, pressure) do not change.
- 18What are the is the circuit symbol for a voltmeter?
- 19How do you connect a voltmeter in a circuit?In parallel with the component you want to measure the voltage of.
- 20What is the circuit symbol for an Ammeter?
- 21How do you connect an Ammeter?In series with the component you want to measure the current over.
- 22What is the circuit symbol for a cell?
- 23What is the circuit symbol for a battery?
- 24What is the circuit symbol for a variable resistor?
- 25What is the circuit symbol for a resistor?
- 26What is the circuit symbol for a bulb or lamp?
- 27What is the circuit symbol for a switch?
- 28What will a graph of voltage against current look like for an Ohmic Conductor?
- 29What is resistance measured in?Ohms
Information
- Description
- Key facts and equations needed for Year 9 Electricity
- Created by
- Kate Wainwright · Dec 2019
- Updated
- Dec 17, 2019
- Views
- 210
- Tags
- Rating