In an AC system, a sine wave can be used to represent both current and what other values?

In an AC system, a sine wave is a fundamental waveform that can graphically represent voltage as it varies over time. Voltage in an alternating current (AC) circuit oscillates between positive and negative values, creating a periodic wave that is typically described by a sine function. This representation is essential for understanding how voltage behaves in AC circuits, as it illustrates both the amplitude and the phase of the voltage as it cycles through its positive and negative peaks.

While current also follows a sine wave pattern in an AC system, voltage is the primary other value represented in this manner. Understanding this relationship helps in analyzing how current and voltage interact, particularly in terms of phase differences, which is crucial for calculating impedance and power in AC systems.

The other options, such as charge, resistance, and power, do not inherently have the same cyclical behavior represented by a sine wave. Charge is a static quantity rather than a dynamic one that varies over time in a predictable sine wave form, while resistance is a constant value that does not change with time or frequency in an AC system. Power in an AC circuit can be represented in a waveform under certain conditions but is often calculated based on the product of voltage and current in their respective phases, thus not directly represented by a simple