Answer: an electric current.
- A direct strong heating
- B an electric current
- C a beam of bright light
- D loud sound waves
Correct answer: B. an electric current
Explanation: In electrolysis, an electric current drives an otherwise non-spontaneous chemical decomposition.
In a Daniell cell, electrons flow externally from the zinc anode (oxidation) through the voltmeter to the copper cathode (reduction), while the salt bridge completes the circuit.
Concept context
Explore the link between chemical reactions and electricity. Covers galvanic cells, electrolysis, standard electrode potentials, the Nernst equation, and real-world applications like batteries and corrosion.