What is current?
Current is the flow of elecrtical charge
What is the unit of current?
Amps, A
In a single loop is the current the same or different everywhere?
Same
What is potentail difference unit?
Volt, v
Whats the equation for charge flow?
Charge flow = current X time
What is the equation linking PD and current?
PD = current X Resistance
What is the IV characteristic of linear components? eg: fixed resistor
straight line
What is the IV characteristic of non-linear components? eg: lamp
curved line
What is the LDR dependent on?
intensity§ of light
In bright light, was does the resistance do in a LDR?
Falls
What is a thermistor dependent on?
temperature
In hot conditions what does the resistance fo in a thermistor?
falls
In which circut does the total PD is always all the PD’s added up?
Series circuits
Total resistance equals what in a series circuit?
All resistance added up
Why are parallel circuits better than series circuits?
Because if one component breaks or stops working, the whole circiut can still work.
In a parallel circuit, the PD equals what?
they all equal the same
As you add resistance would happens to resistance?
Resistance – adding resistance reduces the
total resistance.
What does AC mean?
AC – alternating current.
What does DC mean?
DC – direct current.
What are the three wires called in a plug?
live, neutral and earth.
What is the live wire?
Live wire – provides the potential difference from the mains.
What is the neutral wire?
Neutral wire – completes the circuit.
Why do we have a earth wire?
Earth wire – protection.
what is the step-up trandformers?
Step-up transformers – increase the voltage
as the electricity flows through the cables.
