Resistors
From Wikiversity
A resistor is an electronic component that resists, restricts, or opposes the flow of current. It can be visualized as constriction or narrowing in a pipe, where the constricted area is the resistance (resistor), and the flow of water is current. The volume of water flow following a constriction in a water pipe is reduced.
The resistive property of this type of component can be attributed to a material which has much lower electrical conductivity than regular conductive materials such as metals.
Ohm's law can be used to calculate the resistance present in a DC circuit if voltage and current are known.
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[edit] Resistance
Every resistor has a resistance calculated as:
where:
- R is resistance (ohms, Ω),
- V is voltage (volts, V),
- I is current (amperes, A).
[edit] Conductance
Conductance is defined as the inverse of resistance, calculated as:
where:
- G is conductance (siemens, S).
[edit] Voltage
Voltage is calculated as:
[edit] Current
Current is calculated as:
[edit] Power
Power is calculated as:
