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# Download Unit: Electricity and Magnetism Topic(s): Circuit

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Electricity Unit 2 Topic(s): Circuit Basics and Friends Learning Goals: •Discuss the relationship between voltage, current, resistance, and power in a DC Circuit •Discuss the role of batteries, capacitors, and resistors in a circuit •Define and describe conventional current •Predict the impact on capacitance/resistance of a material by altering its physical properties •Analyze power situations and apply the appropriate equation •LG #12 (there is too much to write here...) Circuits at a glance… • A complete circuit is a closed path for a charge to follow. • A voltage source (potential diff) is needed to “make” the charge go • A moving charge is called current • “Stuff” that gets in the way of the moving charge is called resistance (or resistors) • “Stuff” that collects/stores charge are called capacitors Batteries • Batteries provide a potential difference (one terminal is at 0V) • Charges move out of the + end of the battery and go towards the – end • Aligning batteries can make a big battery (in your calculator and other things) Battery Current • Current is moving charge (the video talks of batteries being electron pumps). • Conventional Current: We pretend that + charges are the things that move to create current. • Depending on how the current is created it can be direct current (DC, from batteries) or it can be alternating current (AC, from the wall) • Units are C/s or A (for Ampere) Resistance • Things can get in the way of the moving charge. • Physical characteristics can play a part in resistance (insulators and conductors) • p 508 table of resistivity. Temp and Resistance Ohm’s Law • Some materials obey a linear relationship between voltage and resistance • These items are called Ohmic • Ohm’s law can also be used to determine total current in a circuit, voltage drop in a circuit element, and lots of other swell stuff. Electric Power • Rate of converting electrical energy • Units [Watts] • Operating power under ideal conditions • 1st equation is on AP sheet. Remaining equations are derived using 1st and Ohms Law To Sum things up These equations are fairly simple and they will serve as the building blocks for DC circuit analysis Ohm’s law will be as useful as Fnet was. You may use the equation 3 or more times in a solution. You will want to use subscripts to keep track of resistances, voltages, and currents. Our investigations will consist of ideal (word problems) and non-ideal (real world). Read carefully Draw sketches/diagrams with proper labels