**Ohm's Law** states that there is a **linear relation** between **voltage**, **current** and **resistance**. The law states that

*V = IR*

where V is **voltage**, measured in **volts (joules/coulombs = Energy/Charge)**, I is the **current**, measured in **amps (coulombs/seconds = Charge/time)** *and* R is **resistance**, measured in **ohms (**Ω**)**** (joules.seconds/coulombs)**.

In a circuit, the voltage is the push that the electrons are being given, like the pressure which causes them to move in the first place. The current is the flow of electrons, and it is defined as the charge of a circuit per second. The resistance is almost like friction. Anything which slows down the flow of electrons around a circuit is a **resistor**. This causes **resistance**, which is measured in **ohms**.

Therefore, **as current increases**, **voltage increases**. When **resistance increases**, **voltage increases**. A **decrease in voltage** could be due to **either a decrease in current** or** a decrease in resistance**.

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