Household electricity is supplied in the form of alternating current that varies from 155 V to 2155 V with a frequency of 60 cycles per second (Hz). The voltage is thus given by the equation Estd 155 sins120td where t is the time in seconds. Voltmeters read the RMS (root-mean-square) voltage, which is the square root of the average value of fEstdg2 over one cycle. (a) Calculate the RMS voltage of household current. (b) Many electric stoves require an RMS voltage of 220 V. Find the corresponding amplitude A needed for the voltage Estd A sins120td.
Advertising Test 3 Study Guide: Key Terms: Chapter 12: Media Planning Essentials • Deal proneness: the ease with which a consumer can get a deal, know what a good deal is, operate with knowledge of what a good price would be, and know a seller’s cost • Price/cost transparency: ease with which consumers can find out the price of a product and the seller’s cost • Above-the-line promotion: traditional measured media advertising; any message broadcast to the public through conventional means such as TV, internet, radio, and magazines • Measured media: media that are closely measured to determine advertising costs and effectiveness; TV, radio, newspaper, magazines and outdoor media • Belo