For example, if a 300- ohm resistor is attached across the terminals of a 12-volt battery, then a current of 12 / 300 = 0.04 amperes flows through that resistor. The ohm (symbol: Ω) is the SI unit of electrical …

Jun 13, 2021 · A resistor (also known as an electrical resistor) is defined as a two-terminal passive electrical element that provides electrical resistance to current flow. Resistance is a measure of the …

Jul 7, 2025 · A resistor is a passive electronic component designed to limit or regulate the flow of electrical current in a circuit. Resistors play a critical role in functions like dividing voltage, controlling …

一、电阻的定义与核心作用 电阻是电子电路中用于 限制电流、分压、调节信号电平、消耗功率 的基础被动元件，其阻值（Resistance）单位为欧姆（Ω）。其核心作用可归纳为：限流保护：防止元器件过 …

Sep 26, 2025 · resistor, electrical component that opposes the flow of either direct or alternating current, employed to protect, operate, or control the circuit.

The resistor is a passive electrical component that creates resistance in the flow of electric current. In almost all electrical networks and electronic circuits they can be found.

Jul 3, 2025 · A resistor is a little package of resistance: wire it into a circuit and you reduce the current by a precise amount. From the outside, all resistors look more or less the same.

Apr 30, 2025 · So what exactly do they do, and how does a resistor work? In this beginner-friendly guide, we answer that question and explore everything you need to know about resistors, including …

A resistor is a passive two-terminal electrical component that limits the current flowing in electrical or electronic circuits. Its property to resist the flow of current is called resistance, expressed in ohm (Ω), …

电阻器（Resistor）在日常生活中一般直接称为电阻。 是一个限流元件，将电阻接在电路中后，电阻器的阻值是固定的一般是两个引脚，它可限制通过它所连支路的电流大小。