Which statement about Ohms in circuits is correct?

Which statement about Ohms in circuits is correct?

• A. The unit of resistance
• B. The unit of current
• C. The unit of power
• D. The unit of voltage

Answer: (A)

Resistance tells you how much a component opposes current flow. The unit used to measure that opposition is the ohm. An ohm is defined as the ratio of voltage to current: Ω = V/I, meaning one ohm is one volt per ampere. Because of this, the statement that ohms are the unit of resistance is the correct one. It isn’t the unit for current (which is amperes), for power (watts), or for voltage (volts). In a welding circuit, this relationship helps you predict current with a fixed voltage: I = V/R, so higher resistance means less current and, for a given voltage, less heat generated.

Resistance tells you how much a component opposes current flow. The unit used to measure that opposition is the ohm. An ohm is defined as the ratio of voltage to current: Ω = V/I, meaning one ohm is one volt per ampere. Because of this, the statement that ohms are the unit of resistance is the correct one. It isn’t the unit for current (which is amperes), for power (watts), or for voltage (volts). In a welding circuit, this relationship helps you predict current with a fixed voltage: I = V/R, so higher resistance means less current and, for a given voltage, less heat generated.