9.1 Electric current

4 of 4 objectives have lessons · 0 studied · 0 secure

Lessons

Electric current as a flow of charge carriersCurrent is a flow of charge carriers; they have quantised charge (multiples of e). Conventional current flows positive to negative; electrons flow opposite. 5 min, not started
Using I = Q/t — charge, current and timeCalculate charge, current or time from the other two quantities. Work with coulombs, amperes, seconds, minutes, hours. Convert between units. 5 min, not started
Microscopic view of current — I = nAvqDerive and use I = nAvq. Link macroscopic current to number density n, cross-sectional area A, drift velocity v, and charge q. Compare drift speeds in different materials. 5 min, not started

4 objectives

What Cambridge says you should be able to do, in our words. Codes are the topic number plus the objective’s position.

9.1.1

Understand that an electric current is a flow of charge carriers.

Taught in: Electric current as a flow of charge carriers · 5 questions

9.1.2

Understand that charge carriers have quantised charge.

Taught in: Electric current as a flow of charge carriers · 2 questions

9.1.3

Recall and use Q = It.

Taught in: Using I = Q/t — charge, current and time · 8 questions

9.1.4

For a current-carrying conductor, use I = Anvq, where n is the number density of charge carriers.

Taught in: Microscopic view of current — I = nAvq · 6 questions