Intermediate 2 physics Electricity an electronics
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Created by:
FergusFingers on May 15, 2012
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17 terms
Terms | Definitions |
|---|---|
 Charge | (Q) the amount of electricity traveling through a circuit. it is measured in coulombs (C) |
| Current | (I) is the amount of charge passing in unit time (1s). I = Q / t it is measured in amperes (A) |
| Ammeter | is placed in line (in series) with the circuit. |
| Voltage | is a measure of the energy givin to the charges in a circuit. |
| Voltmeter | is placed across (in parallel with) the component being measured. |
| Resistance | is when materials oppose charges passing through them. Increasing the resistance of a circuit decreases the current. R = V / I |
| Series circuits | have all the components in a row or loop.There are no branches there is onlt |
| Potential divider circuit | use 2 or more resistors or a potentiometer to provide a part of a voltage. |
| Parallel circuits | have more than one path for the charges to follow |
| Power | is the rate at which energy is transformed P = E / t |
| Energy | how many joules of electrical energy have been transformed? E = Pt |
| Direct Current | Electrons move in only one direction. |
| Alternating Current | Electrons movement is back and forth. |
| Light emitting diodes (LED) | are made from two semi-conductor materials. When electrons cross the junction in the correct direction it emits --light. The diode symbol has to 'point' from + to - from a power supply. |
| The thermistor | as the temperature increases, its resistance decreases. |
| The light dependent resistor (LDR) | as the light increases its resistance decreases. |
| Amplifier | the purpose of it is to increase the amplitude of an electrical signal. |
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