Why are house circuits often wired in parallel rather than in series?

Why are house circuits often wired in parallel rather than in series?

• A. To ensure each appliance gets full supply voltage and independent operation
• B. To ensure equal currents through all devices
• C. To require all devices to operate at the same time
• D. To reduce total current drawn from the supply

Answer: (D)

The key idea is that house circuits are wired in parallel so each appliance can operate independently and receive the full supply voltage. In a parallel setup, the voltage across every branch is the same as the mains, so lights stay bright and devices run as intended regardless of what other appliances are doing. If devices were in series, the supply voltage would be split among them, so adding more devices would reduce the voltage across each one and many wouldn’t work properly. Also, if one device fails open in a series circuit, it can stop the current for everything else. The total current drawn from the supply is the sum of the currents in all branches, so more appliances mean more total current, not less. This combination of keeping a full, consistent voltage and allowing independent operation is why parallel wiring is used.

The key idea is that house circuits are wired in parallel so each appliance can operate independently and receive the full supply voltage. In a parallel setup, the voltage across every branch is the same as the mains, so lights stay bright and devices run as intended regardless of what other appliances are doing. If devices were in series, the supply voltage would be split among them, so adding more devices would reduce the voltage across each one and many wouldn’t work properly. Also, if one device fails open in a series circuit, it can stop the current for everything else. The total current drawn from the supply is the sum of the currents in all branches, so more appliances mean more total current, not less. This combination of keeping a full, consistent voltage and allowing independent operation is why parallel wiring is used.