Question

when an electric circuit operates, a buzzer makes a sound. what happens to the electric charges in this circuit?
the electric charges move from the energy source and are used up at the switch.
the electric charges move from the energy source and are used up at the buzzer.
the electric charges move from the buzzer through the energy source and back to the buzzer.
the electric charges move from the energy source through the buzzer and back to the energy source.

Explanation:

In a closed electric circuit, electric charges (electrons) flow in a loop. The energy source (like a battery) provides the potential difference to make charges move. Charges move from the energy source, through the load (buzzer here) which uses electrical energy (converts to sound), and then back to the energy source. Charges aren't "used up"—they circulate. Let's analyze each option:

• First option: Charges aren't used up at the switch (switch just controls the circuit, not consume charge). Eliminate.
• Second option: Charges aren't used up at the buzzer (buzzer uses energy, not the charges themselves). Eliminate.
• Third option: Direction is wrong—charges start from the energy source, not the buzzer. Eliminate.
• Fourth option: Correctly describes the cyclic flow: from energy source, through buzzer (where energy is used), back to energy source.

Answer:

D. The electric charges move from the energy source through the buzzer and back to the energy source. (Note: Assuming the options are labeled A, B, C, D in order. If original labels differ, adjust, but based on the order: the last option is correct.)