## Related questions with answers

How to calculate a voltage drop across a single resistor?

Solution

VerifiedIn order to calculate the voltage drop across the single resistor we can use **Ohm's law**:

$V=I\cdot R$

Here:

$V$ stands for the voltage drop across the resistor.

$R$ stands for the resistor resistance.

$I$ stands for the current that flows through the resistor.

If we have the resistors that are connected in parallel with the battery, then the voltage drop across all resistors is equal to the battery voltage.

But if we have resistors that are connected in series, the voltage drop can be determined by using the upper equation.

Now the problem is how to determine the current through the resistor.

The current can be determined by using the ammeter or can be determined if we are familiar with battery voltage and total resistance in the circuit.

$I=\dfrac{V}{R_t}$

Here: $I$ is the current through resistors, it's equal through each resistor because they are in series.

$R_t$ stands for the total resistance in the series circuit:

$R_t=R_1+R_2+\dots+R_n$

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