Contribution margin is a measure of operating leverage: the higher the contribution margin is (the lower variable costs are as a percentage of total costs), the faster the profits increase with sales.
What is a snap switch also known as Snap Disc or snap action thermostat? Snap Disc, or snap switch thermostats are bimetal mechanical thermostats that function via the thermal expansion and contraction of a bimetal disc that âsnapsâ from a convex to a concave shape at a set temperature. When the disc âsnapsâ, it either completes or interrupts a circuit.
The switchhook is the device that senses whether the handset or receiver is in its cradle. The term flash originated from the cord circuit of the early telephone switchboard that telephone company operators used to connect calls. The calling party and called party each had an indicator light on the cord circuit. When the subscriber cycled the telephone on-hook/off-hook, the light would flash.