Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Electrical engineering wikipedia , lookup
Nanogenerator wikipedia , lookup
Electronic engineering wikipedia , lookup
Switched-mode power supply wikipedia , lookup
Regenerative circuit wikipedia , lookup
Opto-isolator wikipedia , lookup
Index of electronics articles wikipedia , lookup
Flexible electronics wikipedia , lookup
Rectiverter wikipedia , lookup
Integrated circuit wikipedia , lookup
Section 3—Electrical Energy • To use electrical energy, a complete circuit must be made • Series Circuit—current has only one loop to flow through *Used in flashlights and some holiday lights (Circuit types continued) • Open circuit—when any part of a series circuit is disconnected, no current flows through the circuit – Ex: when 1 X-mas bulb is out, the whole string is out!! Parallel Circuits • Parallel circuits—contain two or more branches for current to move through. • Advantages: – When one branch of the circuit is opened, the current continues to flow through other branches – Ex: rooms in houses, cars, etc. – Fig. 18 on pg. 210 Household Circuits • In most homes, wiring is organized and logically connected • Wiring is hidden behind walls, under floors, etc. • Standard voltage difference in US is 120 V • There is a main switch and circuit breaker/fuse box for homes • Parallel circuits branch out to rooms/appliances (more on household circuits) • Many houses draw current from the same circuit • As the amount of current increases, so does the amount of heating in the wires • If wires get too hot, insulation melts and bare wires can cause a fire • For protection, homes have fuses or a circuit breaker Fuses and Circuit Breakers • Fuses—small pieces of metal that melt if current becomes too high, and causes a break in the circuit, current flow stops • Circuit breaker—contains a switch to flip and open the circuit, stopping the flow of current/usually can be reset by moving switch to its “on” position Electrical Power • Electrical power—the rate at which electrical energy is converted to another form of energy – Used by appliances/varies – Calculating Power: POWER = CURRENT X VOLTAGE DIFFERENCE OR P(watts) = I (amperes) X V (volts) Electrical Energy • The amount of electrical energy you use depends on two things: – Power required by appliances in your home – How long the appliances are used – Calculating Energy: • ENERGY = POWER x TIME OR • E(kWh) = P (kW) x T(h) Kilowatt Hours • Kilowatt-hour = the unit of electrical energy One kilowatt= 1,000 Watts SECTION REVIEW QUESTIONS