Course Content

  • ohms_law

Course Content


The voltage across a resistor can be considered as an indirect measure of the current flowing through the resistor. It is an effective way to determine how much current is flowing through a resistor without actually measuring it directly. We will take this idea further and use this concept to measure the flow of electrons in an electrochemical cell. This is the graph of the resistance of Ohmic resistor for different values of (Ri, i = 1, 2, 3). Non- Ohmic resistors (R4, light bulb) do not obey Ohm's Law.

Ohm's law has often been stated as, "for a conductor in a given state, the electromotive force is proportional to the current produced." This is the most basic of the Law of Conservation of Energy. The rate at which energy is transported across a circuit does not change with the applied voltage or current.

The strength of a direct current is directly proportional to the potential difference and inversely proportional to the resistance of the circuit.

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