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60 Cards in this Set
- Front
- Back
Front (Term) |
Electric motor |
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Conventional current |
Positive -> negative |
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Electron flow |
Negative -> positive |
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Insulators |
Electrons are bound to atoms and able to move. No current can pass through material, no charge carriers. |
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Conductors |
Most electrons bound to mets atoms, some delocalised. Delocalised electrons attracted towards positive terminal when pd applied. |
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Semi-conductors |
Bound to atoms but have ability to be liberated. Number of charge carriers increases with increased temperature. |
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Difference between potential difference and voltage |
Voltage is the absolute energy per coulomb of charge in a fixed place. Potentia difference is the difference in energy per coulomb of charge between 2 point. |
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Difference between potential difference and voltage |
Voltage is the absolute energy per coulomb of charge in a fixed place. Potentia difference is the difference in energy per coulomb of charge between 2 point. |
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EMF |
Electromotive force , energy transferred to charge carriers per coulomb of charge, by electrical energy source. |
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Power |
Rate of energy transfer |
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Power |
Rate of energy transfer |
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Resistance |
Measure of how much component opposes the flow of charge carriers/current. |
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Power |
Rate of energy transfer |
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Resistance |
Measure of how much component opposes the flow of charge carriers/current. |
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The higher the resistance... |
Smaller the potential difference and current. |
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Power |
Rate of energy transfer |
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Resistance |
Measure of how much component opposes the flow of charge carriers/current. |
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The higher the resistance... |
Smaller the potential difference and current. |
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Resistance arises from... |
Repeated collisions of charge carriers with eachother and ions in material. |
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Power |
Rate of energy transfer |
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Resistance |
Measure of how much component opposes the flow of charge carriers/current. |
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The higher the resistance... |
Smaller the potential difference and current. |
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Resistance arises from... |
Repeated collisions of charge carriers with eachother and ions in material. |
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Resistor |
Designed to have fixed resistance |
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Power |
Rate of energy transfer |
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Resistance |
Measure of how much component opposes the flow of charge carriers/current. |
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The higher the resistance... |
Smaller the potential difference and current. |
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Resistance arises from... |
Repeated collisions of charge carriers with eachother and ions in material. |
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Resistor |
Designed to have fixed resistance |
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Resistance of resistor can be measured by... |
Varying current and measuring potential difference across it. |
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Power |
Rate of energy transfer |
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Resistance |
Measure of how much component opposes the flow of charge carriers/current. |
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The higher the resistance... |
Smaller the potential difference and current. |
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Resistance arises from... |
Repeated collisions of charge carriers with eachother and ions in material. |
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Resistor |
Designed to have fixed resistance |
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Resistance of resistor can be measured by... |
Varying current and measuring potential difference across it. |
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Ohm's Law |
Potential difference across conductor is directly proportional to the current through it, provided physical conditions do not change (temperature) |
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Superconductor |
Material that has 0 resistivity, below a critical temperature that depends upon the material. |
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Superconductor |
Material that has 0 resistivity, below a critical temperature that depends upon the material. |
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Front (Term) |
Ammeter |
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Superconductor |
Material that has 0 resistivity, below a critical temperature that depends upon the material. |
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Ammeter |
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Front (Term) |
Voltmeter |
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Cell |
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Potential difference-current graph's gradient shows... |
R |
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Front (Term) |
Light source/indicator |
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Front (Term) |
Diode |
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Front (Term) |
Light-emitting diode |
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Front (Term) |
Resistor |
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Front (Term) |
Variable resistor |
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Light-dependent resistor |
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H |
Heater |
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Electric motor |
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Front (Term) |
Electric motor |
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Resistors in parallel |
1/R1+1/R2 |
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Resistor in series... |
R1+R2+R3 |
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Internal resistance |
Loss in potential difference per unit current, as current passes through source |
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Voltmeter should have a ... Resistance |
Infinitely high |
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Ammeter should have ... Resistance |
No |
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Potential divider |
2 or more resistors in series with fixed potential difference source |
