Normal electric wall sockets that power a hair dryer or curling iron are _____ volts.

• A. 240
• B. 12
• C. 120
• D. 60

Answer: (C)

Normal home outlets are designed to supply about 120 volts, which is the voltage most hair dryers and curling irons expect to use when plugged into a standard wall socket. That makes 120 volts the right match for these devices in typical residential settings. The other voltages don’t fit standard household outlets: 240 volts is used for heavier appliances or in regions with different power systems, 12 volts is common for low‑voltage circuits, and 60 volts isn’t a standard residential supply.