When two electrical components are connected in parallel, what is the relationship of the applied voltage across them?

When two electrical components are connected in parallel, the fundamental principle governing their connection is that the voltage across each component is the same. This occurs because both components share the same two nodes in the circuit and the same potential difference is applied across them.

In practical terms, if you measure the voltage across each component in a parallel connection, you will find that it remains constant, unaffected by the values or resistances of the individual components. This characteristic is crucial in circuit design, as it allows for consistent voltage levels across multiple components, which can influence how they operate.

Thus, if you connect a resistor and a bulb in parallel to a power supply, both the resistor and the bulb will experience the same voltage from the power supply, which ensures that they function correctly according to their design specifications. The concept is essential for ensuring that devices operate efficiently and predictably in parallel configurations.