Electricity Flashcards
what are the conditions for charge to flow?
a closed circuit with a source of p.d
charge equation
Q= It
what is static electricity?
build up of charge on an insulator
what is current?
rate of flow of charge
what is shock?
- p.d between student and tap
- electrons transfer from student
to the tap - static charge is discharged
what is p.d?
energy transferred between 2 points
what is resistance?
opposition to current
p.d equation
V=IR
energy equation
E=QV
what is series circuit?
a circuit with one loop
what is a parallel circuit?
a circuit with more than one loop
parallel vs series
parallel series
I - split same
V - same split
R - lower sum
relationship between R and I ?
The greater the resistance of the component
the smaller the current for a given potential difference (pd) across
the component.
resistance rp
- attach crocodile clip on 0cm on
the metre rule - attach the other clip at a fixed
distance eg. 10 cm - record the length
- close the switch and record ammeter and voltmeter readings
- open switch and move the second clip another 10 cm
- repeat those steps again for the different lengths
- calculate resistance for the lengths using V=IR
- plot a graph with your results, your line should be straight and passes through the origin
what is an ohmic conductor?
The current through an ohmic conductor (at a constant
temperature) is directly proportional to the potential difference
across the resistor. This means that the resistance remains
constant as the current changes.
