Look at the picture. The motor symbol in the picture represents an electric fan. When the switch S 1 is closed, cold air is sent, indicating that the electric fan circuit is connected, the heating element circuit is disconnected, the electric fan is connected in parallel with the heating element, and the fall switch is on the main road. B and d in the picture are obviously meaningless; The drop switch requires the heater to disconnect the power supply in case of accidental drop. Observe figures a and c carefully. There is a spring in the switch. When placed normally, it will compress the spring under the gravity of the heater and connect the circuit. When it falls, the switch will disconnect the power supply under the action of elastic force. Figure a meets the requirements, and a is optional.
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