Ohm's Law 1
Ohm's Law Graphs
Circuits
Parallel and Series Circuits
Electromagnetism
100
What is Ohm's Law the relationship between?
Voltage, Current, and Resistance
100
What does the slope represent in the graph?
Resistance
100
True or False: The lightbulb will turn on if the circuit is open.
False
100
What kind of circuit is this?
Series
100
Which battery will make a more powerful electromagnet? Why?
- 3 V battery
- 9 V battery
9 V battery because it has a higher voltage
200
Which two variables of Ohm's Law have a direct relationship?
Current and Voltage
200
Which line has the most resistance? Tell me why.
T2 because it is closer to Voltage
200
Give an example of a load?
a lightbulb, motor, buzzer, etc.
200
Which is NOT an advantage of a parallel circuit
- they're more complicated and expensive
- if one bulb goes out, the others will still be lit
- it's easy to find the broken item
they're more complicated and expensive
200
What is the difference between a permanent magnet and a temporary magnet (electromagnet)?
Permanent magnet: can never be turned off
Temporary magnet (electromagnet): can be turned on or off
300
Which two variables have an inverse relationship?
Current and Resistance
300
Which graph correctly shows the relationship between voltage and current?
Graph 4
300
What's the difference between a conductor and an insulator?
Conductor: electricity goes through it easily (like copper)
Insulator: electricity does not pass through it easily (like plastic)
300
Would a house be wired with parallel or series circuits? Why?
Parallel because if you turn off your lamp, the rest of the house appliances will still stay on (reasons may vary).
300
Which statements will increase the electromagnet's power?
statements 1 and 2
400
A device has 0.4 A of current and is powered by a battery 1.5 V. What is the resistance?
3.75 ohms
400
What is the resistance of this graph?
2.5 ohms
400
What's the difference between a motor and a generator?
Motor: transfers electrical energy into mechanical energy
Generator: transfers mechanical energy into electrical energy
400
If I add bulbs to both circuits, what will happen to the brightness of the bulbs?
Model A: the bulbs will be dimmer
Model B: the bulb's brightness will not change
400
Which electromagnet is more powerful? Why?
Electromagnet B because it the wire is wrapped more around the nail
500
My device use two 4 V batteries and has a resistance of 0.5 ohms. What is the current?
16 A
500
True or False: The resistance in this graph is constant.
True
500
Would adding a motor increase or decrease the current of the wire? Why?
Adding a motor would decrease the current because the motor has a higher resistance
500
Which switch will turn off bulb #2 ONLY?
Switch 1
500
If I have the materials shown below, how can I make an electromagnet?
Attach the wire to both ends of the battery and wrap the wire around the nail. The paperclips will be lifted towards the nail because it's magnetized.