What role does a system clock play in a computer?

The system clock is a fundamental component of a computer that determines the timing of all operations within the CPU, effectively controlling the speed of these operations. It generates a series of pulses at a constant rate, which helps synchronize the actions of the hardware within the computer. Each pulse can signal the CPU to perform a task, move data, or execute instructions, thereby regulating how fast the processor can perform calculations and manage tasks.

By defining a clock rate (measured in hertz), the system clock ensures that all components are working in harmony, processing information in a timely manner. If the clock speed is higher, the CPU can execute more instructions per second, leading to better overall performance. This is why understanding the role of the system clock is crucial when considering the efficiency and speed of computer operations. The other options do not accurately describe the function of the system clock; for example, processing input commands, managing memory allocation, and providing power are performed by different components within the computer system.