Warmup How are a voltage source and a capacitor different? How are a resistor and an open switch similar?

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Presentation transcript:

Warmup How are a voltage source and a capacitor different? How are a resistor and an open switch similar?

Warmup Start work on your circuits practice packet. Have out your Waves Lab writeup for collection if not already turned in, plus Ch. 34 notes.

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

Warmup 1)What is different about an electric circuit system and an electrostatic system? 2)How does a transformer work?

Warmup Which circuit elements can store energy in some form or another? Which circuit elements rely on resistance in order to function? What decimal value does the binary number have?

Vocabulary ConceptVariableUnit LabelDefinition VoltageVVolts (V)How hard the electrical field is pushing electrons CurrentIAmps (A) (coloumbs/s) How many electrons flow per second ResistanceROhms (Ω)How easily the material allows the electrons to move PowerPWatts (W) (coloumbs * volts/ s) Work done per second ChargeqColoumbs (C)6.24×10 18 electrons or protons InductanceLHenries (H)How much a current affects (and stores potential energy) in magnetic fields CapacitanceCFarads (F) (coloumbs/volt) How much charge can be built up as a result of a voltage

Circuits Practice April 11, 2012

Circuits Practice 1 Design a circuit that could produce a magnetic field of two different strengths.

Circuits Practice 2 Design a circuit that could take a 9V battery and produce a 4.5V source for something.

Circuits Practice 3 Design a circuit which uses two 2 Ω and one 5 Ω resistors to create a total of a 6 Ω resistance.

Circuits Practice 4 Design a circuit which powers a 50W item, using 120V of potential, where the item has a resistance of 1.5 Ω.

Circuits Practice 5 Design a circuit which sends 2A of current through one wire, and 1A of current through the other wire.

Circuit Practice 6 Create a circuit diagram which charges a capacitor at 6V, using a 9V source, where the capacitor can create a burst of magnetic fields in either direction.

Circuit Practice 7 Create a circuit which has a total resistance of 16,666 Ω using only 10,000 Ω resistors.

Circuit Practice 8 Create a circuit which flips a magnetic field back and forth, which is called an electric motor.

Circuit Practice 9 A circuit has two 4 Ω resistors in parallel, which are in series with a 2 Ω resistor. Draw the circuit and calculate the total resistance.

Circuit Practice 10 Two 5 Ω resistors are in parallel. This is combined in series with a 6 Ω resistor and in series with three 6 Ω resistors in parallel. Draw the circuit. Calculate the combined resistance.

Transistors

Transistor Construction

Resistors Color Code Color Sig. figures MultiplierTolerance Temp. Coefficient (ppm/K) Black0×10 0 –250U Brown1×10 1 ±1%F100S Red2×10 2 ±2%G50R Orange3×10 3 –15P Yellow4×10 4 (±5%)–25Q Green5×10 5 ±0.5%D20Z Blue6×10 6 ±0.25%C10Z Violet7×10 7 ±0.1%B5M Gray8×10 8 ±0.05% (±10%) A1K White9×10 9 –– Gold–×10 -1 ±5%J– Silver–×10 -2 ±10%K– None––±20%M–

To-do Hands-on practice: 1) Resistors in series 2) Resistors in parallel 3) Current through a circuit with a known resistance 4) Voltage sources in series Lab design: 1) Choose circuit or electrostatic-based system 2) Identify circuit elements needed to move object, or method to generate charge. 3) Find resistances, calculate current, and see if voltage source can provide it. 4) Troubleshoot anticipated problems with additional circuit elements.