Download - EG Robotics

New Frontiers Study Questions
Study for the weekly review questions! At the start of each class we ask students questions about
what they learned the week before. If you know the answer you may get AMP Dollars!
Week 1 Review Questions
Q) What is Electricity?
A) The flow of electrons from one atom to the next.
Q) How do generators generate electricity?
A) When the magnet spins it interacts with the coil of wire and forces the electrons to move, which creates
electricity.
Q) Explain how two LEDs could alternate lighting up when hooked up to the generator.
A) LEDs only light up when the electricity is flowing in the correct direction. If you place two LEDs with short leg
to long leg and hook it up to the generator then each time the electricity switches direction it will light up one of
the LEDs. The generator creates AC power which alternates the direction.
Q) What charge does an Electron have?
A) A Negative charge
Q) What charge does a Neutron have?
A) A neutral charge
Q) What does AC mean?
A) Alternating Current
Q) What direction does AC power flow?
A) The electrons flow back and forth in alternating current.
Q) What does DC Mean?
A) Direct Current
Q) What direction does DC power flow?
A) The electrons flow in one direction - Negative to Positive!
Q) Which leg is positive on an LED?
A) The long leg of the LED is positive.
Q) Generators produce what type of power?
A) AC power!
Q) Solar panels produce what type of power?
A) DC power!
Q) How much voltage does an AAA battery supply?
A) It supplies 1.5 volts (Bonus: Rechargeable battery supplies 1.2 volts)
Week 2 Review Questions
Q) What does a resistor do and what does it look like?
A) A resistor limits the flow of electrons (electricity)
Q) What does a transistor do and what does it look like?
A) A transistor is an electronic switch when turned on allows more electricity to flow. It’s like a draw bridge.
Q) What does a capacitor do and what does it look like?
A) A capacitor is like a battery that it can store electricity. When a capacitor fills up it releases the electricity.
Q) What does an LDR do and what does it look like?
A) An LDR is a Light Dependent Resistor. It changes resistance based on light. When light shines on it the
resistance lowers. When it has no light the resistor is at its highest.
Q) The battery packs we use are in a series or parallel circuit?
A) Normal battery packs are in a series circuit. A series circuit will increase the voltage while a parallel circuit
will increase the amperage.
Q) How many volts does a 3x AAA battery pack supply?
A) 4.5volts. Each battery supplies 1.5 volts and because it is in a series circuit you add them together
1.5+1.5+1.5 = 4.5volts
Q) Which leg on the resistor is positive?
A) Trick questions – Resistors do not have a positive or negative leg. They can be inserted in either direction.
Week 3 Review Questions
Q) How does a bump switch work?
A) A bump switch connects Closed (C) and Normally Closed (NC) when not pushed down. When pushed down
it connects Closed (C) and Normally Open (NO).
Q) What is a laser?
A) A laser is a single color of light focused into one spot.
(LASER stands for Light Amplification by Stimulated Emission of Radiation)
Q) Explain how the Laser security system works.
A) The laser light is pointed at the LDR which keeps the buzzer from going off. When someone walks in front of
the laser the light level on the LDR drops and turns the buzzer on.
Week 4 Review Questions
Q) How do you make an electromagnet?
A) Take wire and wrap it in a coil. Use Iron, Cobalt, or Nickel in the center of the coil to make it stronger.
Supply power through the wire to make the electromagnet turn on.
Q) Why use copper or aluminum wire instead of other metals?
A) They conduct electricity very well at an affordable price. (The most conductive metal is Silver)
Q) Tell me about each leg of an RGB LED.
A) The legs in order are Red, Common Positive, Green, Blue.
Q) How does a tilt switch work?
A) The switch is turned on when the switch is upright. When the switch turns over the metal ball inside slides
and disconnects the circuit.
Q) What is a potentiometer?
A) A potentiometer is a resistor that you can change the resistance by turning the knob.
Q) Which pin does the positive power connect to on a 7 segment LED?
A) The positive power is connected to the top center pin on the 7 segment LED.
Week 5 Review Questions
Q) How does the robot go back and forth?
A) The DPDT switch changes the positive and negative to the motor, which switches the polarity of the motor
and makes it go backward or forward.
Q) How much voltage does their battery pack supply?
A) The 4x AAA battery pack supplies 6 volts as each battery supplies 1.5v.
Q) If your car isn’t working what should you check?
A) Check batteries, check switch, check the wires to the motors, and check to see if any wire is accidentally
touching another and short-circuiting it.