Current (Edexcel GCSE Physics Combined Science): Flashcards

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Definition of electric current

Flow of electrical charge

Unit of electrical charge

Coulombs (C)

Unit of current

Amperes (A)

Instrument used to measure current

Ammeter

Formula linking charge, current & time

Q=ItQ = It

In Q=ItQ = It, what does QQ represent?

Charge flow in coulombs (C)

In Q=ItQ = It, what does II represent?

Current in amps (A)

In Q=ItQ = It, what does tt represent?

Time in seconds (s)

Condition needed for current to flow

Circuit must make a complete loop

Definition of potential difference

Driving force that pushes charge around

Unit of potential difference

Volts (V)

Definition of resistance

Anything that slows flow down

Unit of resistance

Ohms

Effect of higher potential difference on current

Higher current

Effect of higher resistance on current

Smaller current

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