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The pump affinity laws state that flow is proportional to speed, head varies with the square of speed, and power varies with the cube of speed. Boyle’s law (B) describes gas pressure-volume relationships, Bernoulli’s principle (C) addresses fluid energy conservation, and Pascal’s law (D) relates to pressure transmission in fluids. For Certified Energy Managers, affinity laws are essential in evaluating energy savings from variable speed pumping systems.

Lumens per watt (lm/W) measures the amount of visible light produced per unit of electrical power consumed, directly indicating energy efficiency. Lumen output (A) measures brightness only, CRI (B) measures color accuracy, and CCT (D) measures light color. For Certified Energy Managers, higher lm/W ratings allow selection of energy-efficient lighting solutions that reduce electricity costs while maintaining visual comfort.

Commissioning verifies that building systems meet design specifications and performance goals. Continuous monitoring ensures operational efficiency and identifies issues early. Reactive maintenance (A) addresses problems after failure, preventive maintenance (B) schedules routine service, and ignoring performance (D) risks inefficiency. Certified Energy Managers implement commissioning and monitoring protocols to optimize energy use and maintain comfort levels.

Depth of discharge (DoD) measures how much of a battery’s total capacity can be used before recharge. Round-trip efficiency (A) measures energy losses, cycle life (C) tracks lifespan, and power density (D) reflects output rate. For Certified Energy Managers, DoD is critical in sizing storage systems, as deeper discharges often reduce cycle life and affect cost-effectiveness.

Clamp-on ammeters measure current without disconnecting circuits, enabling real-time energy monitoring. Lux meters (B) measure light, thermocouples (C) measure temperature, and flow meters (D) measure fluid flow. Certified Energy Managers use ammeters for load profiling and energy auditing.