A Simple Electric Circuit

Physics · Class 6–10 See why a bulb only glows when the circuit is complete, and which way the current flows. syllab.in · free

A Simple Electric Circuit

🧠 Remember it A circuit needs a closed loop: cell → wire → bulb → back to the cell. "Break the loop, break the flow." Conventional current flows from + to − (electrons actually move − to +).

🌏 In real life A torch lights only when you slide the switch to complete the loop — flick it off and you create a gap (open circuit), so the current stops instantly.

📝 Quick notes A circuit is a closed conducting loop through which current flows. Main parts: a cell/battery (source), connecting wires, a bulb/load, and a switch. Closed circuit = complete loop → current flows → bulb glows. Open circuit = a gap → no current. Conventional current flows from the + terminal to the − terminal in the external circuit.

🎯 Test yourself Why does a bulb not glow when the switch is open? The loop is broken (open circuit), so no current can flow.

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