20480919
Description
Flashcards by Kate Wainwright, updated more than 1 year ago
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Created by Kate Wainwright
over 4 years ago
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| Question | Answer |
| What is current? | The rate of flow of charge |
| What is the unit for current? | Amperes A |
| What equation links charge, current and time? | Q=It or I=Q/t or t=Q/I |
| What is charge? | A property of matter that can be positive or negative. |
| What is the unit of charge? | Coulombs C |
| The flow of current in metals is due to which particles moving? | electrons |
| What is voltage? (sometimes called potential difference) | The energy transferred per unit charge or The energy transferred by one Coulomb of charge |
| What do LEDs do if a current flows through them? | They light up |
| What does LED stand for? | Light Emitting Diode |
| In a parallel circuit, how does current behave at junctions? | It splits, but the total current flowing into the junction is always equal to the current flowing out. |
| In a series circuit, how does current behave? | It is the same all the way round the circuit |
| What is voltage (or potential difference) measured in? | Volts V |
| What is resistance? | A measure of how difficult it is to get a current to flow through a component. or The Voltage required to push a current of one Ampere through a component. |
| What equation relates voltage, current and resistance? | V = I R or I=V/R or R=V/I |
| What does a variable resistor do in a series circuit? | Its resistance can be changed to make the current larger or smaller. |
| What does a variable resistor do to current in a parallel circuit? | Its resistance can be changed to make the current in its branch larger or smaller. It does not affect the current in the other branches though. |
| What is an ohmic conductor? | A material for which the current and voltage are directly proportional, as long as its physical conditions (temperature, pressure) do not change. |
| What are the is the circuit symbol for a voltmeter? | |
| How do you connect a voltmeter in a circuit? | In parallel with the component you want to measure the voltage of. |
| What is the circuit symbol for an Ammeter? | |
| How do you connect an Ammeter? | In series with the component you want to measure the current over. |
| What is the circuit symbol for a cell? | |
| What is the circuit symbol for a battery? | |
| What is the circuit symbol for a variable resistor? | |
| What is the circuit symbol for a resistor? | |
| What is the circuit symbol for a bulb or lamp? | |
| What is the circuit symbol for a switch? | |
| What will a graph of voltage against current look like for an Ohmic Conductor? | |
| What is resistance measured in? | Ohms |
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