Electricity Flashcards
What was there be in a circuit to allow electrical charge to flow through
Potential difference
What is electric current
The flow of electrical charge therefore the size of electric current is the rate of electrical charge
What is the unit for charge
C coulombs
What does current depend on through a component
The resistance of the component and the potential difference across the componant
What does the graph of an ohmic resistor look like
Straight line through the origin
What does the graph for filament lamp look like and why
It is a curve in an S shape because as resistance increases in a filament lamp the temperature also increases
What does the graph of a diode look like and why
A straight line in only one section of the graph because a diode can only let current flow in One Direction
What happens to the resistance of a thermistor as temperature increases
The resistance decreases
What is the resistance of an LDR do you want light intensity increases
Resistance decreases
What are the three main wires in a plug and got the colour
Live wire is brown
Neutral wire is blue
Earth wire is green and yellow
What does each wire do in the plug
Do you live wire carries alternating potential difference from the power supply and the neutral wire complete circuit and the Earth why is there to safety to stop an appliance becoming live
What is the national grid
It is a system of cables and transformers linking power stations to consumers
