# Ch1 Fundamentals Noise MT

Question Answer What are 3 components of atoms? 1. electrons, 2. protons, 3. neutrons Electron change negative Protron charge postive Free electron- negative charges moving as current (in metals) What happens to an atom if it looses electrons? becomes positively charged Reactions between charges (2) 1. attraction, 2. repelling What are charges often expressed as? Coloumb (C) Coloumb found that the __________ between two electrical field bodies and the ___________ on them are proportional. force, charges What is a unit of charge called? Coloumb 1 Coloumb= _________ electron 6.24 x 10 ^8 What are the carries of charge? electrons, ions, protons What is electricity housed by? charges What are positive charge carriers? metal ions (e.g., K+) or protons What are negative charge carries? electrons, ions like Cl- What are two types of electricity? 1. Static electricity, 2. flowing electricity What is flowing electricity aka? What does flowing electricity become? current **What is flowing electricity likely to be carried by? Why? electrons (esp. in solid) electron is light a free to move (in metal) ** What is potential determined by in electricity? determined by voltage in electricity What is voltage determined by? charge (postive charge– high voltage) When charges are accumulated in electrical fields two poles What is potential? the difference in energy status (high or low potential) How do electrons flow, in regard to polarity? postive to negative What is an electrical field? a space with a potential difference (voltage) Charges of similar polarity are repelled Charges of opposite polarity are attracted In metal ___________ are the carrier of current. Why? Electrons, because they can move The direction of current is marked by the direction of ____________. positive charge movement What is the driving force to move charge in electrical field? voltage difference What is current? How much charge is moved in a certain amount of time (Q/T) The unit of current Ampere What is the density of current? current/area What is energy? The potential/ability to do work What is work? (Equitation) Voltage x Charge What is voltage (in terms of work and charge) Voltage= work/charges— the work to be done to move unit charges What is power? The work to be done in unit time… P= J/ sec= voltage x charges/ sec = V x I What is the quantify of electricity (e.g., unit of electricity you would see on your electricity bill) KWh One kWh can light a light bulb of 40 watts for how long? 25 hours (kWh= wattsxhour/ 1000)