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.
Elastic and inelastic demand are measured as the percentage of change in the demand for something divided by the percentage of change in price. Similarly, elastic and inelastic supply are measured as a percentage of change in the supply of something divided by the percentage of change in price.