Which statement best describes an open circuit?

Which statement best describes an open circuit?

• A. A complete circuit with no load
• B. An interruption in the flow of power
• C. A generator failure
• D. A short path of low resistance

Answer: (B)

An open circuit is a break in the conducting path that prevents current from flowing. For current to travel, a complete loop is needed; when a switch is opened, a wire breaks, or a fuse blows, the path becomes open and the current drops to zero. With an open, the resistance is effectively infinite, so I = V/R leads to almost zero current even though a voltage may be present on one side. The load won’t receive power because there’s no continuous path for electrons to return to the source. This differs from a complete circuit with no load, which still forms a closed loop but draws no energy, a generator failure that stops generation itself, or a short circuit that creates a low-resistance path and excessive current rather than stopping the loop.

An open circuit is a break in the conducting path that prevents current from flowing. For current to travel, a complete loop is needed; when a switch is opened, a wire breaks, or a fuse blows, the path becomes open and the current drops to zero. With an open, the resistance is effectively infinite, so I = V/R leads to almost zero current even though a voltage may be present on one side. The load won’t receive power because there’s no continuous path for electrons to return to the source. This differs from a complete circuit with no load, which still forms a closed loop but draws no energy, a generator failure that stops generation itself, or a short circuit that creates a low-resistance path and excessive current rather than stopping the loop.