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Warmup

Warmup. 100,000 J of energy are added to a 10g block of ice starting at -5*C. What temperature does it end up at? Q = m C ∆T Q = m L C s = 2.11 J/g K C l = 4.18 J/g K Cg = 2.08 J/g K L f = 334 J/g Lv = 2260 J/g. Electromagnetis m Basics. MARCH 30 TH , 2012. Essential Standard.

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Warmup

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  1. Warmup 100,000 J of energy are added to a 10g block of ice starting at -5*C. What temperature does it end up at? Q = m C ∆T Q = m L Cs = 2.11 J/g K Cl = 4.18 J/g K Cg = 2.08 J/g K Lf = 334 J/g Lv = 2260 J/g

  2. Electromagnetism Basics MARCH 30TH, 2012

  3. Essential Standard Students can solve problems to determine characteristics of circuits involving voltage sources, resistors, and capacitors using Ohm’s Law and the Power Law. Students can draw and interpret field diagrams and relate them to the force on a charged particle. Students understand how a transistor operates and how it is used in technology. Students understand the link between electricity and magnetism and can identify the orientation of a current or magnetic field using the Right Hand Rule.

  4. Vocabulary

  5. Circuit Diagram Symbols Voltage Source Wire Meter Resistor Capacitor Inductor Switch (closed) Switch (open) Ground

  6. Practice Diagrams

  7. Equations V = I * R Ohm’s Law P = I * V Power Law xt = x1 + x2 + x3… Serial resistors or parallel capacitors 1/xt = 1/x1 + 1/x2 + 1/x3… Parallel resistors or serial capacitors

  8. Practice Problems (Ohm’s and Power Laws)

  9. If the voltage in the system is increased: • I and II • I, II, and III • I and III • II and III • III only • None of the above The force on electrons is increased. More current should flow. More power will be consumed.

  10. Batteries store: • Charge • Current • Voltage • Inductance • Capacitance • Power

  11. If you lower the voltage on a charged capacitor: • Current will flow forward to increase the charge. • The power of the system decreases. • Current will flow backwards to decrease the charge. • Inductance will store lost energy in a magnetic field. • None of the above.

  12. A circuit has a resistance of 4 Ohms and a voltage of 3 Volts. What current flows through it? • 4/3 Amps • ¾ Amps • 1 Amp • 12 Amps • 4/3 Farads • ¾ Farads • 1 Farad • 12 Farads

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