Current and Potential Difference Flashcards Preview

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Flashcards in Current and Potential Difference Deck (7):
1

What is current?

The flow of electric charge round the circuit. Current will only flow through a component if there is a potential difference across that component. Unit: Ampere, A

2

What is Potential difference?

(same as voltage) The driving force that pushes the current around. Unit Volt, V

3

What is resistance?

Anything in the circuit which slows the flow down. Unit:, ohm, Ω

4

The greater the resistance across a [ ], the [ ] the current that flows (for a given [ ] across the component)

component
smaller
potential difference

5

Current =

Charge / Time
Current: Amperes (A)
Charge: Coulombs (C)
Time: seconds (s)

6

A battery charger passes a current of 2.5 A through a cell over a period of 4 hours. How much charge does the charger transfer to the cell altogether?

Q = It
= 2.5 * (4*60*60)
= 360,000 C (or 36kC)

7

Potential Difference =

Work Done / Charge
P.D: Volts, V
Work Done/Energy Transferred: joules, J
Charge: Coulomb, C