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Published byMiles Wheeler Modified over 8 years ago
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Electric charges move in a looped path called a circuit – starts and ends in the SAME spot A simple circuit contains a source of energy and at least one conductor Energy (battery) Conductor - wire
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A circuit may also contain a SWITCH A switch opens and closes a gap in the circuit A closed switch allows energy to flow through An open switch stops the current from flowing
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The source of energy may be a battery Chemical energy inside a battery transforms into Electrical energy Energy flows from the negative (-) end of a battery to the positive (+) end The flow of electrons is electricity Some electric energy always changes to heat energy
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Resistors can change electrical energy into other forms of energy (heat, light, sound, motion) EXAMPLES Light Bulb turns Electrical Energy into Light Energy Bells & Buzzers turn Electrical Energy into Sound Energy
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A circuit diagram is a MAP of a circuit Turn to page 484 in Textbook
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Most electrical circuits are more complex than the one in a flashlight or a bell or buzzer A parallel circuit has more than one branch or pathway A computer circuit has millions of paths It still needs to be CLOSED for the electricity to flow Starts and ends at same point Parallel Circuit Diagram
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Electricity and Magnetism are closely related Every electrical current produces a magnetic force An electromagnet is a magnet that carries an electrical current Like a magnet Has north and south poles Unlike a magnet Can be switched on and off
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