Parts of a Circuit
Energy Transformation in a Circuit
Parallel vs. Series Circuits
Conductors and insulators in a circuit
Mixed Bag
100
A student is constructing an electrical circuit. Which of the following can provide energy for the circuit?
A.electric generator
B. Wire
C. light bulb
D.buzzer
Answer: A. an electric generator
100
The type of energy a circuit always starts off with is ________________ energy.
Electrical
100
In a parallel circuit electricity has ______ path(s) to follow.
multiple
100
Some students test a plastic spoon as a connector in an electrical circuit. Electricity does not flow in the circuit. Plastic is most likely... A. a load. B. an energy source C. a conductor D. an insulator
D. an insulator
100
Which of the following is an example of an analog signal?
a. Buzzer
b. Door bell
c. light switch
d. dimmer switch
d- dimmer switch has an infinite probability/ range
200
What is the role of a load in an electric circuit?
The load is the part of the circuit that receives electrical energy and can be turned on.
200
Which part of a circuit changes electrical energy into another form of energy?
The load
200
If one load stops working in a series circuit what happens to any other loads in the circuit?
They also stop working.
200
Which material will best conduct electricity? A. plastic B. rubber C. wood D. silver
D. silver
200
What is referred to as "electrical potential difference?"
voltage
300
Name 2 examples of an energy source.
Battery, electric generator, photocells, thermocouple
300
Which device can be added to an electrical circuit to convert electrical energy into mechanical energy? A. a switch B. a lightbulb C. a fan D. a speaker
C. a fan
300
Do you think Christmas Lights are an example of a series circuit or a parallel circuit? Why do you think that?
They are an example of a series circuit because if one of the bulbs burns out the entire strand will not light up.
300
If you connect the wires of an electric circuit to a piece of jewelry why would the lightbulb in the circuit still turn on?
Because the jewelry is made of something that can conduct electricity.
300
If the current in a series circuit is 6.8 A and the resistance is 2.1 ohms, what is the voltage?
14.3 volts
400
Explain how a switch works in an electrical circuit.
When the switch is on the circuit is closed so electricity can flow. When the switch is off the circuit is open so electricty cannot flow.
400
If an electrical circuit has a bell for a load and a battery for an energy source what energy conversions will occur?
chemical energy --> electrical energy --> sound energy
400
What would be the voltage across R2?
24O volts - voltage remains unchanged in a parallel circuit
400
Ms. T wants to make an electric circuit but she is fresh out of copper wire. What are 3 other household items that she could use in place of wire to carry the electricity to the load?
silverware metal necklaces steel wool keys aluminum foil etc.
400
If two 9 volt batteries are connected in series having a resistance of 3 ohms, what is the current?
6 amperes
500
a. What is the resistance in the below circuit?
b. What would happen to the current if the resistance is doubled?
R = V/I
R = 5 V/1A
R = 5 Ohms
The current would be cut in half.
500
Name a load that can transform electric energy into thermal energy and name another load that can transform electric energy into sound energy.
Thermal- lightbulb, heater, soldering iron
Sound- radio, speaker, phone, computer etc.
500
If all the loads of a robot were wired in a series circuit, what would happen if the one of the lightbulbs in the robot burned out?
All the loads of the robot would not work because the electricity only has one path to follow in a series circuit.
500
Why do electricians use wire that is coated in plastic when they are making new circuits?
This is because the wire can be dangerous to handle and can shock humans if they handle it when the circuit is on. The plastic coating helps to protect the electricians and us!
500
What is the effect of changing the wire in a circuit from a straight thin wire to a straight thick wire?
The bulbs will become brighter- less resistance.