Flashcards
Electric current
Cards in this deck (9)
- 1Define electric currentCurrent is defined as 'the rate of flow of charge'.
- 2State the unit of charge and give its symbol.The unit of charge is the coulomb (symbol: C ).
- 3Give the equation for electric current
- 4According to this equation, one amp is equivalent to...One amp is equivalent to one coulomb per second.
- 5Define the coulombOne coulomb is the charge transferred when a current of one amp flows for one second.
- 6Re-arrange this equation to make charge the subject.
- 7The current in a certain wire is 0.35 A. Calculate the charge passing a point in the wire in i) 10 s, ii) 10 min.Use this equation and don't forget that time must be given in seconds.
Answers: i) 3.5 C ii) 210 C
- 8Calculate the average current in a wire tyhrough which a charge of 15 C passes in i) 5 s, ii) 100 s.Use this equation.
Answers: i) 3 A ii) 0.15 A
- 9Which way does conventional current flow in this circuit? Which way do electrons move in the circuit?Conventional current flows (anticlockwise) from positive to negative. Electrons move in the opposite direction (from negative positive).
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- Flashcards on Electric current, created by lthistlewood2013 on 16/09/2014.
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