If the current exceeds a safe value, the strip melts. This opens the circuit and stops the current. Fuses are rarely seen in modern wiring. A material that does not conduct electricity. A conductor wrapped in insulation forms the wiring found in homes and buildings.
Most modern insulators are plastic or vinyl.
As a first order approximation, power is the product of the voltage times the current. Power is a measure of how much work can be done in a certain period of time. An additional electrical panel installed after the main circuit breaker panel. Electrical power delivered in three separate phases. This is the way electrical power is typically supplied to buildings.