Lesson 2: Ohm's Law
Presentation
•
Science
•
8th Grade
•
Practice Problem
•
Easy
Onyemachi Okoronkwo
Used 1+ times
FREE Resource
5 Slides • 11 Questions
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Open Ended
Imagine you have a resistor in a circuit powered by a single 3 V battery.
Predict what would happen to the current in the circuit if you replaced the 3 V battery with a 6 V battery. Explain your answer.
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Open Ended
You then remove the battery from the circuit and connect the wires together.
Determine how much current will flow. Explain your answer.
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Multiple Choice
Who was Georg Ohm and what was his contribution to the study of electricity?
He invented the light bulb
He discovered the relationship between current, voltage, and resistance
He created the first battery
He discovered electromagnetic induction
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Multiple Choice
According to the relationship I = mV, what happens to the current if the voltage is doubled while the gradient (m) remains constant?
The current is halved
The current remains the same
The current is doubled
The current becomes zero
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Multiple Choice
A circuit with a 9 V battery has a current of 3 A.
Calculate how much current would flow if the same circuit was powered by a 3 V battery.
0.3 A
1 A
3 A
9 A
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Fill in the Blanks
Type answer...
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Multiple Choice
Which of the following statement IS NOT correct about the effect of resistance on current at constant voltage?
Doubling resistance halves the current
Current is inversely proportional to resistance
Current is directly proportional to resistance
Resistance must be measured in ohms
13
Draw
The circuit in a particular walkie-talkie has a total resistance of 450 Ω and the battery is supplying 9 V.
Calculate how much current, in amps (A), is flowing.
(Solve the question in the blank canvas)
14
Draw
You have a red LED that you want to connect to a 12 V battery. The maximum current that it's safe to put through this LED is 10 mA.
Calculate how much resistance the circuit needs.
Hint: Remember that there are 1000 mA in 1 A.
(Solve the question in the blank canvas)
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Draw
You've been given a new robot for Christmas! The total resistance of its internal circuitry is 900 Ω and the current it requires is 5 mA.
Calculate how many 1.5 V batteries it will need to operate.
Hint: Remember that there are 1000 mA in 1 A.
(Solve the question in the blank canvas)
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Open Ended
What questions do you still have about Ohm's law or its applications in real-world circuits?
Show answer
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