Countdown to the Science STAAR" Series 5 / Page 5 3 1 Which statement about the flow of electricity in a circuit is correct? A Electricity travels in light waves. B The flow of electricity requires an insulator. C. The flow of electricity requires a switch. D The flow of electricity requires a complete circuit. 5.6.E

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UpStudy AI · Accepted Answer

**Step 1: Understand How Electricity Flows**

Electricity flows when there is a complete path, called a circuit. Without a closed loop, the current cannot circulate.

**Step 2: Analyze Each Option**

- **Option A:** Electricity travels in light waves.  
  This statement is incorrect because electricity involves the movement of electrons, not light waves.

- **Option B:** The flow of electricity requires an insulator.  
  Insulators do not allow electricity to flow; rather, conductors allow the flow. Thus, this statement is incorrect.

- **Option C:** The flow of electricity requires a switch.  
  A switch controls the flow of electricity, but it is not necessary for the current to flow if the circuit is complete. This statement is incorrect.

- **Option D:** The flow of electricity requires a complete circuit.  
  This is correct because for current to flow, the circuit must be closed. Mathematically, a complete circuit allows the current $$ I $$ to be given by the relationship  
  $$
  I = \frac{V}{R}
  $$
  where $$ V $$ is the voltage and $$ R $$ is the resistance. If the circuit is open (incomplete), $$ I $$ would be zero.

**Step 3: Conclusion**

The correct answer is:

**D. The flow of electricity requires a complete circuit.**
The flow of electricity requires a complete circuit.

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