101098
| Question | Answer |
| what is the current potential graph for a resistor at a constant temperature? |
Image:
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| how can you find the resistance of a component? | measure the current through using an ammeter, the pd across in parallel and then use the equation V=IR |
| what is resistance measured in? | ohms |
| what is the pattern for a potential difference- current graph across a resistor? | the current is directly proportional to to pd |
| the greater the resistance.. the GREATER/SMALLER the current for a given potential difference across a component | smaller |
| the pd provided by cells is calculated how when the cells are connected in series? | the sum of the pd of all the cells |
| for components connected in series, the total resistance is calculated how? | the sum of the resistance of each component |
| the total pd in a series circuit is ....... by the compontents | shared |
| there is the SAME/DIFFERENT current through all components in a series circuit | same |
| how is the pd effected when components are connected in parallel? | the potential difference across each component in parallel is the same |
| why is the resistance of a filament lamp not directly proportional? | 1) the charge flowing through a material collides with ions in the metal, causing resistance 2) As the temperature increases due to the filament light heating up, resistance is increased as the metal ions vibrate 3)causing more collisions and making it harder for the electrons to travel through, increasing the resistance |
| what does a current pd graph look like? |
Image:
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| what is a feature of the current flowing through a diode? | it flows in one direction only |
| what does the current-pd graph look like in a diode? |
Image:
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| how does an LED work? | emits light when a current flows through it in the forward direction |
| how is the resistance effected in an LDR | the resistance decreases as light intensity increases |
| how is the resistance of a thermistor effected? | the resistance decreases as the temperature increases |
| what is current? | the flow of electric charge |
| whats istime measured in, in the equation Q= I*t | t (time) measured in seconds |
| what is current measured in in the equation Q=IT | I is current and it is measures in Amps or Ampres |
| What is charge measured in in the equation Q=IT | Q= coulombs |
| what is potential difference? | the work done per coulomb of charge that passes between 2 points |
| what is potential difference measured in? | volts |
| what is work done measured in in theequation W=VQ | joules J |
| what o current-potential difference graphs show? | how the current running through a component varies with the potential difference running across it |
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