3841674
Description
Flashcards by Jeffrey Piggott, updated more than 1 year ago
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| Question | Answer |
| Electric current | Flow of electric charge (per unit time) |
| Unit of electric current | Ampere |
| Formula for electric current | I = Q/t |
| Electrical meter for measuring current | Ammeter |
| Circuit symbol for an ammeter | |
| Joule's Law | P = I²R |
| Direction of flow of conventional current | From positive to negative |
| Direct current | (Battery) Flows in one direction only |
| Alternating current | Mains electricity; continuously changing direction |
| Effects of an electric current | 1. Chemical; 2. Magnetic; 3. Heating |
| Kirchhoff's First Law | Current Law: Total current entering junction = Total current leaving junction (based on Law of Conservation of Charge) |
| Kirchhoff's Second Law | Loop Law: In any loop (path) around a circuit, the sum of the e.m.f.'s = the sum of the p.d.'s (based on Law of Conservation of Energy) |
| Resistance | Ratio of the potential difference across a conductor to the current through the conductor (R=V/I), provided temperature & other physical conditions remain constant. |
| Electrical meter for measuring voltage | Voltmeter |
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