Back to the full dot-point answer
SingaporePhysicsQuick questions
Electricity and Magnetism
Quick questions on Current and resistance explained: H2 Physics Electricity and Magnetism
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is potential difference?Show answer
The potential difference (voltage) between two points is the work done per unit charge in moving charge between them:
What is electrical power?Show answer
The power dissipated in a component is:
What is q1?Show answer
Define resistance and state its SI unit. [2 marks]
What is q2?Show answer
A resistor carries a current of . Find the power dissipated. [2 marks]
What is q3?Show answer
Two wires of the same material have the same length, but one has twice the cross-sectional area. Compare their resistances. [2 marks]
Have a question we have not covered?
This dot-point answer is short enough that we have not extracted many short questions yet. Read the full dot-point answer or ask Mo, our study assistant, in the chat for follow ups.