Pulse is a 1988 horror film written and directed by Paul Golding.
The taglines for this movie included It traps you in your house...Then pulls the Plug and also PULSE - The Ultimate Shocker.
When the Columbia Pictures screen is shown before the main movie starts, there's the rather distinct sound of a flame burst which is dubbed into the soundtrack as the torch on the Columbia logo ignites. This is a reference to the Pulse in the film taking control.
A malevolent, paranormal intelligence in the electrical system is moving from house to house. It terrorizes the occupants by taking control of the appliances, either killing them or causing them to wreck the house in an effort to destroy it. Then it travels along the power lines to the next house, and the terror restarts. Having thus wrecked one household in a quiet neighbourhood, the pulse finds itself in the home of a boy's divorced father whom he is visiting. It gradually takes control of everything, badly injures the stepmother, and...