1299313
Descrição
FlashCards por lthistlewood2013, atualizado more than 1 year ago
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Criado por lthistlewood2013
mais de 9 anos atrás
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| Questão | Responda |
| Define electric current | Current is defined as 'the rate of flow of charge'. |
| State the unit of charge and give its symbol. | The unit of charge is the coulomb (symbol: C ). |
| Give the equation for electric current |
Image:
current_equation (image/png)
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| According to this equation, one amp is equivalent to... |
One amp is equivalent to one coulomb per second.
Image:
1A_1Cs-1 (image/png)
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| Define the coulomb | One coulomb is the charge transferred when a current of one amp flows for one second. |
| Re-arrange this equation to make charge the subject. |
Image:
Q_It (image/png)
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| The 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
Image:
Q_It (image/png)
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| Calculate 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 |
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Which way does conventional current flow in this circuit? Which way do electrons move in the circuit?
Image:
circuit1.gif (image/gif)
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Conventional current flows (anticlockwise) from positive to negative. Electrons move in the opposite direction (from negative positive).
Image:
circuit1.gif (image/gif)
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