35034974
Description
Flashcards by Izzy Wright, updated more than 1 year ago
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Created by Izzy Wright
almost 5 years ago
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| Question | Answer |
| What is an electric current? | The flow of electrons |
| What 3 things are in a simple circuit? | (1) Power source (2) wires (3) an electric component |
| Equation for charge? | charge (C) = current (A) x time (s) Q = I x T |
| What is potential difference and what is it measured in? | The difference in energy between two points in a circuit, measured in Volts (v) |
| Equation for potential difference | P.D. (V) = energy transferred (J) / charge (C) |
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Image:
Image (binary/octet-stream)
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switch |
| variable resistor | |
| light dependant resistor | |
| ammeter | |
| diode | |
| battery | |
| light emitting diode | |
| resistor | |
| lamp | |
| cell/power supply | |
| voltmeter | |
| thermistor | |
| Equation for resistance? | resistance (ohms) = voltage (V) / current (A) |
| What are the series circuits rules? | (1) current (I) = same at any point (2) sum of P.D. across component = sum of P.D. across power supply (3) total R = sum of R |
| What are the parallel circuits rules? | (1) P.D. across each branch = P.D. across the power supply (2) sum of current (I) = current leaving |
| What is the required practical method? | (1) connect circuit (2) check Ammeter and Voltmeter for 0 errors and adjust if required (3) increase V incrementally measuiring V and A to max of 12V (Do for the negative too) (4) plot graph, showing current on y-axis and voltage on x-axis (5) Determine gradient |
| What is power measured in? | Watts |
| What is the equation for power, given that current = charge / time and p.d. = energy transferred / charge | power = p.d. x current and energy transferred = power x time meaning power = current squared x resistance |
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