✅ ( 1.5 + 3.0 + 4.5 = 9.0\ \textV ) 4. Common Mistakes & Troubleshooting | Problem | Likely Cause | Fix | |---------|--------------|-----| | No current | Broken connection (open circuit) | Check all junctions | | Current too high | Forgot resistor (short circuit) | Add resistance | | Voltages don’t add to battery | Wrong meter placement | Voltmeters must be parallel , not in series | | Same voltage across all resistors | Resistors are parallel, not series | Re‑wire in single loop | | Ammeter reads zero | Ammeter in parallel (shunt) | Place ammeter in series | 5. Quick Reference: Series Circuit Rules | Quantity | Rule | |----------|------| | Current (I) | ( I_T = I_1 = I_2 = I_3 ) | | Voltage (V) | ( V_T = V_1 + V_2 + V_3 ) | | Resistance (R) | ( R_T = R_1 + R_2 + R_3 ) | | If one bulb breaks | All go out | 6. Practice Questions (with Answers) Q1: You have a 12 V battery and three 40 Ω resistors in series. Find total R, current, and voltage across each resistor.
Total resistance increases, and ( I = V / R ), so current decreases. dc circuit builder series circuit answer key
In a series circuit, why does adding more resistors decrease current? ✅ ( 1