Trimester 1 Final Review Answers

Back to the Review Questions

What is Ohm's Law? - Be able to use it to solve a problem.

  • V=IR
  • If the voltage in a circuit is 9V, and there is a 30 Ohm resistor, what is the current going to be?
  • 9=30I, Divide 30 from both sides (9/30=I), Current is 0.3 Amps

What is the power equation?

  • P = IV
  • How much power is being absorbed by the resistor in the example above?
  • Current = 0.3, Voltage = 9, P=0.3(9), P = 2.7, 2.7 Watts absorbed by resistor

How does a motor work?

  • It has a coil of wire and a permanent magnet. When current flows through the coil of wire, it turns it into an electromagnet. This is repelled or attracted to the permanent magnet and makes the axle turn.

What is the difference between a motor and a generator?

  • In a motor, you connect it to electricity to make it turn.
  • In a generator, you turn it to make electricity.

What device can you use to measure voltage, resistance, and current?

  • A voltmeter measures voltage
  • An ohmmeter measures resistance
  • An ammeter measures current
  • A multimeter

What are the units and symbols for voltage, current, and resistance? Voltage = V, Current = I, Resistance

  • The units for voltage are volts, and the symbol is V
  • The units for current are amperes, (or amps) and the symbol is I
  • The units for resistance are ohms, and the symbol is R.

What does AC stand for?

  • Alternating Current!

What does an ac signal look like?

acsignal.jpg

What is the value of standard AC (wall) voltage?

  • 110V or 115V or 120V

What does DC stand for?

  • Direct Current!

What does a DC signal look like?
sig_01.gif

What is the circuit symbol for a resistor?
res.gif

What do two resistors in series look in a circuit diagram?
chapter2problem34part5su9.jpg

What do two resistors in parallel look?
resistors_in_parallel.gif

What are the steps in the engineering design process?
1. Identify the Need or Problem
2. Research the Need or Problem
3. Develop Possible Solution(s)
4. Select the Best Possible Solution(s)
5. Construct a Prototype
6. Test and Evaluate the Solution(s)
7. Communicate the Solution(s)
8. Redesign

What are some forms of renewable energy?

  • Solar, Wind, Hydroelectric, Biofuel, etc.

What does LED stand for?

  • Light-Emitting Diode

What does an LED do?

  • It only lets the current flow in one direction and it lights up

What was each of the presidential candidates positions on nuclear energy, offshore drilling, and hybrid cars?
Nuclear Energy:
Obama: Supports usage of nuclear energy, but wants it to be safe and secure, doesn't believe that Yucca Mountain is a good place to spill nuclear waste into
McCain: Highly supports usage of nuclear energy, wants nuclear plants to be in America (and not in foreign countries)

Offshore Drilling:
Obama: "Use it or Lose it" policy, doesn't really support, but wants oil companies to use up all of their space before getting more land (to decrease environmental damage)
McCain: Supports offshore drilling, although he opposed it before

Hybrid Cars:
Obama: Supports usage of hybrid cars, wants American-built hybrid cars
McCain: Wants to issue a "Clean Car Challenge" to break dependency on oil

What renewable energy is Germany using to promote green energy?

  • Solar Energy

What is an orthographic drawing? Be able to draw a simple drawing.
Need to view, bottom view, side view, seperate each view and show it in 2d, also called "mulit-view" drawings, is possible to draw all sides, but only top, front, and right-side views are necessary for drawing, scale also needed.

What is an isometric drawing? Be able to draw a simple drawing.
Need top view, bottom view, side view, funny isometric paper, also need to use scale (explanation shown on bottom of page)

Be able to use scale to determine the size of an actual object given the scale and a drawing.

Be able to determine the size an object should be in a drawing given the scale and the object.

*Scale: Drawing:Actual Size, If something was three times bigger in the drawing than the actual, scale would be 3:1, if actual length of one side of an object is 3 inches, then in the drawing, it would be 9 inches (because of the 3:1 ratio)

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