An electronic oscillator is an electronic circuit that produces a periodic, oscillating electronic signal, often a sine wave or a square wave.
Elasticity of supply measures how the amount of a good changes when the producer hires more employees. Elasticity of supply measures how the amount of a good changes when the producer uses new materials. Elasticity of demand measures how the amount of a good changes when its price goes up or down. Elasticity of demand measures how the amount of a good changes when its distribution expands.
The elasticity of supply is the percent change in quantity supplied given (divided by) the percent change in price (% change in quantity / % change in price). Since both price and quantity are increasing or decreasing elasticitys of supply are always positive, whereas elasticitys of demand are always negative.