4007149
Description
Flashcards by Brooke Clark, updated more than 1 year ago
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Created by Brooke Clark
over 8 years ago
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| Question | Answer |
| Current | The measure of the number of electrons passing through a certain point per second |
| Current Equation | I = Q/t I - current (amps, A) Q - charge (coulomb, C) t - time (secs, s) 1 C = 6.24 x10^18 electrons |
| Conventional Current | electrons flow from positive to negative when in actual fact they flow from negative to positive. If not stated always assume conventional current, and state. |
| Voltage | Is a measure of the amount of electrical potential energy changed to other forms of energy per 1 unit of charge between two points. |
| Voltage Equation | V = E/q V - voltage (volts, V) E - change in potential energy (joules, J) q = charge (coulomb, C) |
| Series Circuit | A circuit in which all components are connected one after the other, with only one pathway for electrons to flow along. |
| Current in Series | Current is the same at every point in a series circuit, if the bulbs are identical. |
| Voltage in Series | Voltage is shared/divided among all components in a Series circuit |
| Parallel Circuits | There is more than one pathway for electrons to travel along. If one pathway breaks electrons can continue flowing along the other and the circuit continues to work. |
| Current in Parallel | The sum of the current in the branches is equal to the current which enters and exits the power supply. |
| Voltage in Parallel | Voltage in parallel is the same across each branch as it is in the power supply. |
| Resistance | Is how much an electrical component restricts the flow of current. |
| Ohm's Law / Resistance Equation | V = I R V - voltage (volts, V) I - current (amps, A) R - resistance (ohms, ...) |
| Ohmic and Non-Ohmic Conductors | Ohmic conductors have a constant resistance for all voltge/current reading. They produce linear grpahs. Voltage and current are directly proportional. Non-Ohmic conductors change their resistance as the voltage/current changes. They produce non linear graphs. |
| Resistance in Series | R(total) = R1 + R2 + R3 . . . |
| How Resistance Changes when Resistors are added in parallel | When resistors are added in parallel, the total resistance decreases with every new resistor. This is because of the additional pathways around the circuit for the current to flow, making it easier for current to flow. Thus decreasing the total resistance. |
| How Resistance changes when Resistors are added in Series | When resistors are added, the total resistance is increased. All the resistors add together to create a larger resistance against the flow of current and electrons. |
| Power | A powerful component can convert a large amount of energy over a short period of time. |
| Power Equation | P = E / t P = V I P - power (watts, W) E - energy (joules, J) t - time (secs, s) V - voltage (volts, V) I - current (amps, A) |
| Properties of Lamps | Shorting Lamps - placing another wire in parallel creates a new pathways for current to flow along and therefore it bypasses the lamp and it does not glow Brightness - a bright lamp will convert more energy than a dim lamp and have greater power Blowing Bulbs - lamps are designed to operate at a certain voltage and cannot handle much more than this required voltage or else it will blow and won't work |
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