physics-electricity Flashcards
What is required for electrical charge to flow through a closed circuit?
The circuit must include a source of potential difference.
What is electric current?
Electric current is a flow of electrical charge.
What does the size of an electric current mean?
The rate of flow of electrical charge (how fast the charge is flowing)
How are Charge flow, current and time linked?
Charge Flow = current × time
[Q = I × t]
What is the unit for Charge?
Coulomb ( C )
What symbol is normally used to represent charge? And what happens if this
line is too long?
Q
What is the unit of current
Amperes ( A )
What is the symbol normally used to represent current?
I
How does current change around a closed loop?
It doesn’t: a current has the same value at any point in a single closed loop.
