Cheatography
https://cheatography.com
This is a cheat sheet all about the key terms, formulas in chapter electricity.
This is a draft cheat sheet. It is a work in progress and is not finished yet.
Electric Current
The amount of charge flowing through a particular area in unit time ( or ) it is the rate of flow of electric charges |
In an electric circuit the direction of electric current is taken as opposite to the direction of the flow of electrons, which are negative charges |
If a net charge Q, flows across any cross-section of a conductor in time t, then the current I, through the cross-section is I=Q/t |
The SI unit of electric charge is coulomb (C), which is equivalent to the charge contained in nearly 6 × 1018 electrons. |
The electric current is expressed by a unit called ampere (A) |
One ampere is constituted by the flow of one coulomb of charge per second, that is, 1 A = 1 C/1 s. |
Small quantities of current are expressed in milliampere (1 mA = 10–3 A) or in microampere (1 µA = 10–6 A). |
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Electric Circuit
If the electric charge flows through a conductor (for example, through a metallic wire), we say that there is an electric current in the conductor |
A switch makes a conducting link between the cell and the bulb. A continuous and closed path of an electric current is called an electric circuit. |
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