Year NEN
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What is the symbol for a variable resistor?
Rectangle with diagonal arrow
What is the symbol for an LED?
Circle with triangle and line inside (like a play button) and two small arrows coming off
What is the symbol for a thermistor?
Rectangle with line through (like a hockey stick)
What is the symbol for an open switch?
Two separated circles with a diagonal line from one circle
Which type of circuit has components in different loops?
Parallel
What is current?
Rate of flow of electrons or charge (per second)
What is the unit of current?
A (Amps)
How do we measure current?
With an ammeter in series
What is voltage?
Difference in electrical energy between two points
What is the unit of voltage?
V (Volts)
How do we measure voltage?
With a voltmeter in parallel
What happens to current in a series circuit?
Stays the same everywhere
What happens to current in a parallel circuit?
Splits or shared between loops
What happens to voltage in a series circuit?
Splits or shared between components
What happens to voltage in a parallel circuit?
Stays the same everywhere
What is a measure of how difficult it is for current to flow?
Resistance
What is the unit of resistance?
ohms Ω
What equation links voltage, current and resistance?
Current = Voltage / Resistance
What happens to resistance in series?
Adds up so total resistance is bigger (R=R1+R2)
What happens to resistance in parallel?
Total resistance is lower than the smallest resistance (1/R = 1/R1 + 1/R2)
Draw the current voltage graph for a resistor at constant temperature.
Straight diagonal line (directly proportional)
Draw the current voltage graph for a filament lamp
Curve (as voltage increases current increases at a decreasing rate)
Draw the current voltage graph for a diode
Flat horizontal line and then sharp rise
What is power?
How much energy is transferred per second