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Final Electricity Review Electric Force Law of Static Charges Name:_____________________ Push or pull created by electricity =Action at a distance force (no contact needed) Opposite charges attract (+,-) Like charges repel (+,+ or -,-) Neutral charges attract + and A charged object comes near another object that pushes the like charges away Charging by induction One object picks up electrons from the other object Charging by conduction Current Electricity vs. Static Electricity Units Parts of A circuit Resistance Current electricity : when electricity (electrons) move along a pathway conductor. Static electricity : When electrons build up in one spot (on an insulator) Current (I)= amperes (A) Voltage (V)= volts (V) Resistance(R) = Ohms (Ω) 1) A source of voltage (potential energy) 2) A pathway for the electrons to travel on (usually copper wire) 3) An electric load the ability of a substance to slow down the flow of electrons -electric load = high resistance -wire = low resistance Ohm’s Law resistance(R) = Voltage(V) Current(C) or V = IR circuit with only one pathway for electrons Series circuit Current and Voltage in Series The voltage across all the electric loads add up to the voltage of the battery. Current and Voltage in Parallel Current is the same across the circuit The voltage across electric loads in parallel are all equal to the voltage of the battery The current on the two pathways equals the current from the cell. When an electric circuit has more than one possible pathway for electrons travel. Parallel circuits Battery How do batteries produce voltage Electrochemical cell. Creates electrical energy from chemical energy 1) 2 terminals (-,+) 2) The electrodes two different types of metals 3) The electrolytic solution breaks atoms off electrode leaving some of the electrons behind (becomes negative) 4) At the same time electrons are pulled off the other electrode making it positively charged.