describe how a main gas valve gets electrical power to open
Thermostat As illustrated in the use of the thermostat above, all of the power for the control system is provided by a thermopile which is a combination of many stacked thermocouples, heated by the pilot light. The thermopile produces sufficient electrical power to drive a low-power gas valve, which under control of one or more thermostat switches, in turn controls the input of fuel to the burner.
Small intestine Food from the stomach is allowed into the duodenum through the pylorus by a muscle called the pyloric sphincter.
Cerebrum With the assistance of the cerebellum, the cerebrum controls all voluntary actions in the body.
Electric current The consequence of this convention is that electrons, the charge carriers in metal wires and most other parts of electric circuits, flow in the opposite direction of conventional current flow in an electrical circuit.
Swallowing 5) Closure of the nasopharynx
Limit of a function (the Dirichlet function) has no limit at any x-coordinate.