Mastering Current and Electricity: Conceptual Questions and Practice for 15-Year-Olds

Instructions

Answer the following questions based on your understanding of current, electricity, voltage, resistance, and Ohm's Law. Be sure to show your workings on the math problems and plot the graphs where indicated.

Conceptual Questions

1. What is Ohm's Law? Explain it in your own words.
2. How does increasing the resistance in a circuit affect the current? Explain using an example.
3. Describe the relationship between voltage (V), current (I), and resistance (R). Provide a real-world example.
4. If the voltage in a circuit remains constant, what will happen to the current if the resistance is doubled? Explain.

Math Practice

1. Calculate the current flowing through a resistor of 10 ohms when a voltage of 5 volts is applied. A
2. A circuit has a current of 3 A and a resistance of 4 ohms. What is the voltage across the resistor? V
3. If a circuit has a power of 60 watts and a current of 5 A, what is the voltage? V
4. A circuit consists of a 12V battery and a 6Ω resistor. Find the current using Ohm’s Law. A

Graphing Activity

Plot the following values to create a current-voltage (I-V) graph. Use the resistor values and corresponding current calculated according to Ohm’s Law.

1. Resistance = 2 Ω, Voltage = 2V A
2. Resistance = 2 Ω, Voltage = 4V A
3. Resistance = 2 Ω, Voltage = 6V A
4. Resistance = 2 Ω, Voltage = 8V A

Reflection

Based on your learning, what are the practical applications of Ohm's Law in everyday life? Write a short reflection.

Answers

Conceptual Questions: (Answers will vary based on individual understanding;
1. ,
2. ,
3. ,
4. ).

Math Practice:
1. 0.5 A
2. 12 V
3. 12 V
4. 2 A

Graphing Activity:
For a 2 Ω resistor:
1. 1 A,
2. 2 A,
3. 3 A,
4. 4 A.