Physics
Internal Resistance Of Battery
Measuring the effect and value of internal resistance in a DC circuit.
Mission
Measuring the effect and the value of the internal resistance in a DC circuit.
Curriculum Alignment
| Standard | Syllabus code | Topic | Coverage | Grades | |
|---|---|---|---|---|---|
| NGSS | Weak | 9–12 | |||
| British / IGCSE | 9702 D.C. circuits | CAIE A-Level Physics 9702 — Topic 10 D.C. circuits (EMF and internal resistance) | Full | 11–12 | |
| IB | DP B.5 | DP Physics — Theme B.5 Current and circuits (Cells, EMF and Internal Resistance) | Full | 11–12 | |
| CBSE | Class 12 Ch 3 | CBSE/NCERT Class 12 Physics — Current Electricity (EMF, internal resistance, terminal voltage) | Full | 12–12 | Prescribed practical |
| AERO / AP | AP Physics 2 Unit 11 | AP Physics 2 — Unit 11 DC Circuits (EMF/internal resistance via Kirchhoff's-rules battery problems) | Full | 11–12 |
Variables
What you change
- Resistance value
What you measure
- Voltage drop
What you keep constant
- Wire length
- Wire cross section
- Battery voltage value
- Temperature of wire
Equations
R_i = Internal resistance of battery (ohm)
R = Load resistance (ohm)
V_Bat ≈ 6 Volts
V_R = Voltage drop on load resistance (V)
R_i = \frac{R(V_Bat-V_R)}{V_R}
What You'll Need
- Breadboard 400 Tie Point
- Arduino Uno
- I2C LCD
- 25V Voltage Sensor Module
- 6V Battery Pack, 4x AA
- Resistor
Estimated Time
Virtual mode 8 minTest mode 11 minExercise mode 10 min
Mind-Blowing Fact
Fish battery.
The electric organ of the Knifefish, a popular fish found in aquariums, generates an electric field. This means that it is possible to have a small fish-powered battery in a home aquarium.
How You Can Run It
Virtual modeTest modeExercise modeView-only modeAccessibility modeTobii eye trackingVoice commandsArduino integrationAmericanBritishIB