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Electricity - Statistics
General Stats
- This quiz has been taken 32 times
- The average score is 5 of 39
Answer Stats
| Hint | Answer | % Correct |
|---|---|---|
| what is the unit for charge | coulombs | 40%
|
| does conventional current flow from positive to negative or negative to positive | positive to negative | 37%
|
| which formula links charge, energy and voltage | V=E/Q | 37%
|
| measure of current that flowed within a period of time | charge | 30%
|
| the current through a conductor is directly proportional to the potential difference and inversely proportional to the resistance | Ohm's law | 27%
|
| what is the formula linking charge, current and time | Q=It | 23%
|
| do conductors or insulators have the highest number of charge carriers | conductors | 20%
|
| do semiconductors or insulators have the highest amount of charge carriers | semiconductors | 20%
|
| what is the resistivity of a superconductor below the critical temperature | zero | 20%
|
| give the number of charge carriers for the perfect insulator | zero | 20%
|
| what formula links energy, power and time | E=Pt | 17%
|
| what happens to the resistance of a wire as the cross-sectional area is increased but all other factors are kept the same | it decreases | 17%
|
| what happens to the resistance of an LDR when placed in bright light | it decreases | 17%
|
| what happens to the resistance of a wire as the length is increased | it increases | 17%
|
| cross-sectional area | 13%
| |
| what factors affect the resistance of a wire at constant temperature | length | 13%
|
| how does electron flow differ to conventional current | electron flow is negative to positive | 10%
|
| a potential divider has two resistors in series. If the output voltage is half the supply voltage, the resistors must be | identical | 10%
|
| the average velocity of charge carriers moving through a material due to an electric field | mean drift velocity | 10%
|
| give an example of a material with a high number of charge carriers | metals/graphene | 10%
|
| a circuit that has two or more resistors in series with a power supply | potential divider | 10%
|
| the voltage measured across the terminals of a source | terminal potential | 10%
|
| what is the charge of an electron | -1.6x10^-19 C | 7%
|
| how does resistivity of a metal vary with temperature | as temperature increases the resistivity of a metal increases | 7%
|
| brightness control for a dimmer switch | 7%
| |
| how can the resistance of a thermistor be increased | cool the thermistor | 7%
|
| what is the energy supplied by a power supply per coulomb of charge | electromotive force | 7%
|
| how can we find the number of electrons that have flown past a point | identify the charge | 7%
|
| how does the temperature affect the resistance of wires and resistance | increasing temperature increases the resistance | 7%
|
| what is meant by the difference between the electromotive force of a power supply and the terminal potential | lost volts | 7%
|
| what does a diode do | only allows current to flow one way in a circuit | 7%
|
| resisitivity | 7%
| |
| why does increasing the temperature of a wire increase its resistance | the particles in the wire vibrate faster, slowing the flow of electrons, increasing the resistance | 7%
|
| what is a power supplies internal resistance | the resistance of the power supply itself | 7%
|
| what is Kirchoff's first law | total current flowing into a junction=total current flowing out of a junction | 7%
|
| use number of electrons=charge/charge of an electron | 7%
| |
| variable power supply | 7%
| |
| what are some uses of a variable divider | volume control for a loud speaker | 7%
|
| what is meant by potential difference | work done per unit charge | 7%
|
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