35035583
Description
Flashcards by Aleks Parvanov, updated more than 1 year ago
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Created by Aleks Parvanov
over 2 years ago
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| Question | Answer |
| What is the definition of power (P, W, Watts) and its formulae? | Power (W) is the rate (s) of which energy (J) is transferred. P (W) = E (J) / t (s), 1W = 1J/s P (W) = I (A) * V P (W) = I^2 (A) * R (Ω) P (W) = V^2 / R (Ω) |
| What is the definition of charge (Q, C, Coulombs) and its formulae? | Charge (Q, C) is the rate (s) of current (A) in a circuit. 1C = 1A/s Q (C) = I (A) * t (s) E (J) = V * Q (C) |
| What is the definition of potential difference (V, Voltage) and its formulae? | Potential difference (V) is the difference in electric potential between two points. V = I (A) * R (Ω) E (J) = V * Q (C) P (W) = I (A) * V P (W) = V^2 / R (Ω) |
| What is the definition of energy (E, J, Joules) and its formulae? | Energy (J) is the energy (electrical, thermal) that is caused by the movement of the electrons from one place to another. P (W) = E (J) / t (s) E (J) = V * Q (C) |
| What is the definition of current (I, A, Amps) and its formulae? | Current (I) is the rate of flow of electric charge in a circuit. Q (C) = I (A) * t (s) V = I (A) * R (Ω) P (W) = I (A) * V P (W) = I^2 (A) / R (Ω) |
| What is the definition of resistance (R, Ω, Ohms) and its formulae? | Resistance (Ω) is a measure of the opposition to current flow in an electrical circuit. V = I (A) * R (Ω) P (W) = I^2 (A) / R (Ω) P (W) = V^2 / R (Ω) |
| What are the formulae in a electrical circuit? | P (W) = E (J) / t (s) Q (C) = I (A) * t (s) V = I (A) * R (Ω) E (J) = V * Q (C) P (W) = I (A) * V P (W) = I^2 (A) * R (Ω) P (W) = V^2 / R (Ω) |
| What component matches this graph? | Resistor |
| What component matches this graph? | Diode |
| What component matches this graph? | Filament Lamp / Light Bulb |
| What is Ohms law? | Components that follow Ohms law have a graph with a constant gradient. Ohm's law states that the resistance will stay the same as the potential difference and current go up. Gradient = Resistance. |
| How many Coulombs are in an electron? | 1.6 * 10^−19 |
| How many electrons are in a Coulomb? | 6.25 * 10^18 |
| What are the differences between series and parallel circuits? | Series: Current stays the same everywhere. Parallel: Current gets distributed depending on resistance. When resistance goes up, current goes down. Series: Voltage gets distributed depending on the resistance. When resistance goes up, voltage also goes up. Parallel = Voltage gets distributed equally across each "branch" or resistance. Series: IT = I1 = I2 = I3 VT = V1 + V2 + V3 Parallel: IT + I1 + I2 + I3 VT = V1 = V2 = V3 Series: When turned on, every component gets turned on. Parallel: "Branches" can be turned on separately and multiple can be turned on at the same time. |
| Which factors can affect the resistance in a wire? | Cross-sectional area: When it increases, resistance decreases. Length: When it increases, resistance increases. Temperature: When it increases, resistance increases. |
| What factor can affect the resistance in an LDR (Light-Dependent Resistor)? | The light intensity, as the light intensity increases, resistance decreases. |
| What factor can affect the resistance in an Thermistor (Thermal Resistor)? | The temperature, as the temperature increases, resistance decreases. |
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