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##### Electricity

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**Electrical Force**energex.com.au**An object becomes charged by**• Friction • Conduction • Induction**Charging by conduction.**chasehousing.co.uk**Potential**Electricity can be described like flowing water. Current Load**Charge flows in anElectric Circuit.**Switch • Charge is a quantity of electricity. • Charge has the unit coulomb (C).**An electric circuit has 4 parts:**Switch Load Power Source Connecting Wires**Flowing charge is called current. The symbol is I and the**unit is the ampere or amp (A). SIM**Voltage is a measure of the potential difference between two**places in a circuit. • The unit is the Volt (V). • Voltage IS Potential Energy!!! • Voltage IS NOT flowing charge.**Batteries convert chemical energy into electrical energy!**douglasbattery.com 1. Dry Cell Battery creative-science.org 2. Wet Cell Battery channel4.com**Power plants use generators to produce power. This generator**is called a turbine.**AC/DC**• Direct current (DC) is charge moving in one direction • Alternating current (AC) is charge moving back and forth. • Batteries produce direct current (DC). • The power company uses electrical generators to produce alternating current (AC). • 120V of AC is available at your house’s wall sockets. • It is more efficient for power companies to send AC to your house, but most electrical devices need DC. • These devices have components inside them that convert AC into DC.**i.b5z.net/i/u/1572720/i/**120V AC 9V DC personalsafetysite.com/images diversion-safes.com 1.5V DC sanitarysupplyco.com**Electrical Resistance.**• This is when current flow is slowed down. • Current seems to lose energy. Actually, the electrical energy is converted into heat and/or light. • The symbol is R. • The unit is the ohm (). absak.com Water Heater Element harrisrcs.com alibaba.com Light bulb Stove Top Burners**A conductor’s electrical resistance depends on Four**Variables. • The length of the conductor. • The cross-sectional area of the conductor. • The material of which the conductor is made. • The temperature of the conductor.**The relationship between voltage, current, and resistance**is V = I · R or Ohm’s Law • V = Voltage • I = Current • R = Resistance • (SIM1) (SIM2) fm-transmitter.com Digital Multimeters can measure voltage, current, resistance, and more. esitest.com/img**Electrical Work.**• A voltage source does work when releasing charge. • The unit of electrical work is joules (J). Electrical Power. • The unit of power is called the watt (W). • power = current · voltage P = I · V Paying for Electricity. • The electric company charges you based on the amount of power and the amount of time. • The unit is kilowatt-hour (kW-hr). • 1 kW = 1,000 Watts**eere.energy.gov**Several things in our homes consume electricity.**eere.energy.gov**The hot water heater uses electricity to heat water.**Look for this sticker to find out how your appliance**compares to others that are similar. eere.energy.gov**Does it cost more to use a 100-W light bulb for 1 hour or 3**hours? SIM Does it cost more to use a 100-W light bulb for a 60-W light bulb?**This meter can usually be found outside our home. It keeps**track of the amount of electrical power that your home uses over time. It is illegal to tamper with it!!!**Sources**• Bloomfield, How Things Work. • Krauskopf & Beiser, The Physical Universe. 10th ed. • Tillery, Physical Science.