4.1 - Charge and Current Flashcards Preview

OCR Physics A Level > 4.1 - Charge and Current > Flashcards

Flashcards in 4.1 - Charge and Current Deck (7):
1

What is a Coulomb?

The quantity of charge that passes a fixed point in one second

2

What is Electric Current?

A flow of charge. Measured in amperes (Amps or A)

3

What is Conventional Current?

A model used to describe the movement of charge in a circuit from the positive terminal of a cell to the negative terminal

4

What is Electron Flow?

The fact that charge carriers (electrons) flow from the negative terminal to the positive terminal

5

What is Kirchoff's First Law?

The sum of currents entering any junction is always equal to the sum of the currents leaving the junction

6

What is each letter in I=nAve?

I = Current
n = the number of free electrons per unit volume
A = cross sectional area of the wire
e = the charge on the electron (1.602 x 10^-19C)
v = the mean drift velocity of the electrons

7

What is 1 Coulomb in electrons?

1 coulomb is the amount of charge on 6.25x10^18 electrons or 1 Amp second