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# physics ocr electricity

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daisy ngo

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[Front]

what is this symbol
[Back]

variable resistor

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### Questions:

33 questions
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 What is this symbol Variable resistor
 What is this symbol Diode
 What is this symbol Light emitting diode
 What is this symbol Light dependant resistor
 What is this symbol Thermistor
 What is the equation for current ? Charge/time
 What is the equation for drift velocity ? Current/no of electrons x area x charge on electron
 What is the equation for resistance ? Voltage/current
 What is the equation for emf ? I(R+r)
 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
 How do you find total emf if there are two emf in parallel Subtract them
 How do you find total emf if there are two emf in series Add them
 What happens when you add resistors in parallell? The total resistance decreaces
 Explain the potential difference in parallel circuits Voltage in each branch is the same
 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
 Explain the current in series circuits Current is the same
 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