What are about the voltages in a series circuit of two resistors?

With a multimeter you measure the voltage drop at the resistors.
At each resistor you measure a **voltage of 4.5 volts**.

In the circuit,
the voltage of the battery **(9V)**
completely drops off at the resistors
(This is the direct consequence of **Kirchhoff's Voltage Law (KVL)**).
Since the two resistors are equal,
at each **half** of the voltage **(4.5 V)** drops.

The **implication** of this is perhaps surprising at first:
It does not matter which resistors you use.
As long as they have the **same** resistance
you measure a voltage of **4.5 volts** each.

What happens to the voltages when the resistors are **not equal**?