Currently unavailable: for regular students
Degree: Physics (Masters) - Durham University
|Maths||A Level||£22 /hr|
|Physics||A Level||£22 /hr|
|Before 12pm||12pm - 5pm||After 5pm|
Please get in touch for more detailed availability
Abdul (Parent) November 30 2016
Emma (Student) January 27 2017
Emma (Parent) October 27 2016
Emma (Parent) October 17 2016
Current is the flow of charge in the circuit, a bit like the flow of water in a river, and is measured in Amps (A).
Potential difference is defined as the 'work done per unit charge', which is related to the voltage across (and so the energy supplied to) a component in the circuit. It's measured in Volts, (V).
Resistance is the quantity that describes how difficult it is for a current to flow in a circuit (think of traffic trying to get through a narrow tunnel vs a motorway), and is measured in Ohms, (Ω).
Bonus: do you know the relation between these three quantities?
A: it's called Ohm's law, and it states that R=V/I, or resistance is potential difference divided by current.see more
Hint: the chain rule states that for y=u(x) ^a, the derivative will be dy/dx = dy/du * du/dx
So we just need to find dy/du and du/dx!
In this case u(x)=x-3, so du/dx = 1.
from y=u^(-3), dy/du = -3u^(-4).
This means we know dy/dx = -3u^(-4) * 1
Converting from u to x, we get dy/dx = -3 (x-3)^(-4) .... done!see more