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Gentle Electric Shock

Electromagnetism

★Exhibit Content: Human Body Conductivity ★Interaction: Electromechanical Interaction ★Operation: Visitors place one hand on the electrode plate and turn the hand-crank generator with the other hand to feel a slight electric shock as the current passes through their fingertips. ★Exhibit Description: This exhibit uses hand-cranked power generation to let visitors experience the sensation of an electric shock. The exhibit consists of a voltmeter, an ammeter, electrode plates, and a handwheel. Visitors place their left hand on the hand-shaped electrode plate and turn the handle with their right hand to generate electricity. When current is generated, both the voltmeter and ammeter deflect, and visitors can experience a slight electric shock. Participants turn the generator to produce electricity themselves; when they touch the electrodes, they can feel the electric shock effect caused by a weak current, thereby establishing the important concept of safe electricity use (Note: The electricity generated by oneself is very small and will not harm the human body). ★Scientific Principle: The gentle electric shock exhibit is full of fun. Visitors can clearly feel the tingling sensation when current passes through the human body, yet it is not dangerous, guiding visitors to experience the joy of science with an adventurous mindset. The human body is a conductor. When the human body becomes part of a circuit, current will pass through, causing an electric shock. If the current is extremely small, it will not harm the human body. Experimental data show that the minimum current that causes sensation varies among individuals. For adult males, the average is about 1.01 mA, and for adult females, about 0.7 mA. This value is called the perception current, at which the human body feels a slight tingling due to nerve stimulation. Electricity is terrifying, so how much current is harmful to humans? According to the 'Practical Electrician's Handbook', the safe current for the human body is 30 mA for AC and 50 mA for DC. Although the voltage generated by this hand-crank generator reaches 1000 V, the current is strictly limited to below 15 mA.

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