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physics ocr electricity


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daisy ngo


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what is this symbol
what is this symbol
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variable resistor

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33 questions
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What is this symbol
Variable resistor
What is this symbol
Light emitting diode
What is this symbol
Light dependant resistor
What is the equation for drift velocity ?
Current/no of electrons x area x charge on electron
Define lost volts
The difference between emf and terminal pd when there is a charge flowing
Define terminal PD
The potential difference recorded across the terminals of a cell
Define current
The rate at which charge flows through a component
Define power
The rate at which energy is transferred from one form to another
Define emf
Transfer of energy by charge carriers from other forms to electrical energy
Define potential difference
The transfer of energy by charge carriers from electrical to other forms
Define drift velocity
The average velocity gained by the free electrons of a conducter
Define resistance
The opposition to the passage of current within a component
Explain the potential difference in series circuits
Pd splits in ratios according to resistance
Explain the current in parallel circuits
Current splits into each branch and add to make the total current
How does temperature affect its resistance
As tempt increases it causes ions to gain kinetic energy and move faster making it more difficult to pass without collisions resulting in more resistance
How does the length of a wire affect its resistance?
As the length of the wire increases so does the electrical resistance as electrons experience a smaller pd gradient as wire gets longer. the size of voltage per metre value decreases causing a lower drift velocity and more ions for electrons to collide with
How does the material of a wire affect its resistance?
Metals have delocalised electrons making them good conductors so resistance is lower . plastics and insulators do not so they have a higher resistance
How does cross sectional area of a wire affect its resistance?
A thicker wire means lower resistance as there is a bigger volume of space for the electrons to flow in
What factors affect resistance ?
Cross sectional area , material, length and temperature
What is ohms law?
Current flowing within a conductor is directly proportional to the pd across it provided that physical conditions such as temperature remain constant
What happens when pd is applied across a conducter?
The electrons accelerate and gain kinetic energy
What is kirchoffs second law?
Within any closed loop the sum of the emfs is equal to the sum of the products of current and resistance
What is kirchoffs first law?
Charge flowing into a circuit junction must equal the sum of charge leaving the junction