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GCSE     Resistors     BS1852     Colour Codes     E24     LDR     Parallel     >PIVR Calculations<     Potentiometer     Puzzles     Series     Thermistor     Timing     Types     Voltage Divider    

Resistors PIVR Calculations


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  GCSE    Resistors  0 of 27    Question 1371    BS1852 Resistors 
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Deadline not set18 of 27    Question 438    Ohm's Law and Current Calculations 
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Deadline not set19 of 27    Question 160    Ohms Law 
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Deadline not set21 of 27    Question 561    Resistors 
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Deadline not set22 of 27    Question 2    Resistors in Parallel 
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Deadline not set23 of 27    Question 178    Resistors in Series 
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Deadline not set24 of 27    Question 523    Thermistors 
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Definition of Resistance

Resistance ...

Definition of the Ohm

Ohm's Law

At a given temperature, the potential difference or Voltage drop (V) across a resistor (R) is proportional to the current (I) flowing through it.

Take Nick Reeder's Ohm's Law Challenge

Ohm's Law Calculations

R = V / I

Ohm's Law Triangle

This triangle helps some people to remember that

Ohms Law Triangle

To remember this triangle, try this: The Vase on the table Is Red

 

The ammeter measures the current flowing through the resistor.

The voltmeter measures the voltage across the resistor.

Assume that the meters are ideal and they have no effect on the circuit ...

Flash Practice

Try a few Ohm's Law calculations ...

Power Calculations

Resistors come with a power rating. This is the amount of heat that can be dissipated safely. If this rating is exceeded, the resistor will get too hot and could be damaged or even catch fire.

In these calculations ...

P = I V

P = V2 / R

P = I2 R

Energy Calculations

E   =   P t

Energy is equal to Power (in Watts) x time.

The SI unit of energy is the Joule so one Watt of power for one second would equal one Joule of energy.

When buying electricity, the Joule is an inconveniently small amount so Kilowatt Hours are used instead. This is still Power x Time but Kilowatts and Hours are used instead of Watts and Seconds.

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