P4 Electric Circuits Flashcards
What does Resistance mean
Going against or oppding
What does Electrical Resistance mean
Electrical resistance or resistance in a circuit is the opposition to the flow of charge.
Seen this symbol before? What is it called?
Resistance is measured in a unit called OHMS
What causes resistance
Electric current is the flow of charge around a circuit and resistance is the opposition to this flow of charge (electrons).
What in a circuit could cause resistance?
Length of wire Diameter/cross sectional area of wire What in a circuit increases/decreases resistance? Explain each Heat Conductivity
How do volts work in a parrel circut
The energy gets devided by the number of bulbs / components that use the energy eg 6 volts 3 bulbs, 2 volts per bulb.
How do volts work in a parale circut
The volts of the imput become the volts by the bulbs however the bulbs use up the input faster.
P4 length of a wire resistance equipment.
Equipment: Piece of wire to test,Low-voltage power supply, or battery pack,Variable resistor,Switch,Connecting leads (use your circuit diagram to work out how many), 2 crocodile clips,Heat-resistant mat(s) – enough to stop piece of wire from touching table,Ammeter,Voltmeter, Metre ruler
P4 length of a wire resistance method
1 Write a prediction of what your investigation will find, based on the following hypothesis about why metals have resistance: electrons passing through a wire have to push their way through lots of vibrating ions in the metal.
2 Draw a diagram of the circuit you will use.
3 Write down the steps in your method, making them clear enough that
someone else could read it and understand exactly what to do.
4 Prepare a suitable results table.
5 Carry out your investigation.
G.p.e -> kenetic
G.P.E energy store decreases and the kinetic energy store increases. Energy transferred to surrounding as heat and sound.
Potential Difference equation
V = Potential Difference (V) W = Work (J) V=W/Q Q = Charge (C)
