Electrical repair contractors specialize in the operation, installation, maintenance, and repair of electrical systems. Without electricians, there would be no computers, lights, and televisions plugged into our walls. Electricians bring us electricity by installing wires that carry electricity through homes, factories, and businesses, and they also fix machines. They can add transformers, circuit breakers, and other equipment to control how electricity flows. They can install wires for computers, telephones, and fire alarms. Maintenance involves fixing broken wiring or machines.