Power in an electrical circuit is defined as the rate at which energy is transferred, and in simple circuits it equals the product of the voltage across the circuit and the current flowing through it. Therefore, Watts come from multiplying Volts by Amps, expressed as P = V × I. The units line up: volt × ampere yields watt. This is why the expression that uses multiplication is correct. Addition, subtraction, or division do not yield power in watts. For example, at 120 volts and 2 amps, power is 240 watts. In AC circuits with a nonzero power factor you’d have P = VI cos φ, but for basic problems with resistive loads, P = V × I works.

NERC CIP is the framework designed specifically to guide security controls for the electric grid. It comes from the North American Electric Reliability Corporation and focuses on protecting the bulk electric system by establishing enforceable reliability standards. The idea is to identify critical assets and apply a layered set of cyber and physical security measures so that essential power generation, transmission, and control systems remain protected from threats and disruptions. You’ll see sections that guide how to identify critical assets, how to manage security programs, how to control access, how to secure perimeters around sensitive systems, and how to plan for incidents and recovery. This targeted approach is why it’s the framework utilities commonly rely on to structure their security controls and meet regulatory expectations. By contrast, PCI DSS is about protecting payment card data, not electric grid assets. HIPAA covers healthcare information privacy and security, not critical infrastructure. SOC 2 is a general framework for service organizations focusing on principles like security, availability, and confidentiality, but it isn’t specific to electric utilities or their regulatory environment. So NERC CIP is the best fit for guiding security controls in electric utilities due to its focus, scope, and enforceability within the power sector.

When you have electrical hazards that require restricted entry, the flagging pattern used is three-stripe flagging spaced about 18 to 24 inches apart. This configuration signals a higher level of danger and a need to actively control access to the area. The three stripes create a clear, easily recognizable boundary that warns workers and bystanders that only authorized personnel may enter, helping to prevent accidental entry into a live or exposed electrical zone. The specific spacing keeps the boundary visible along the length of the hazard, even as you move around corners or along uneven ground. The other patterns convey different situations or levels of warning. Fewer stripes or a different spacing would not communicate the restricted-entry requirement as clearly, while more stripes or a wider gap typically indicate a different category of hazard or access control. So the three-stripe, 18–24 inch spacing is the standard choice for marking electrical hazards that require restricted entry.

Color coding of underground utilities uses distinct colors to signal what’s buried, so workers can identify lines at a glance and stay safe. For gas lines, yellow is the standard marker because it is highly visible and widely adopted across codes to indicate flammable gas. When newer gas line installations are identified, yellow helps differentiate them from older markings and from other utilities. That’s why this statement is the best one: yellow specifically flags gas lines, aligning with common safety color conventions. Other colors map to different utilities—blue for water, green for sewer, and orange-related markings for other services—so they don’t indicate newer gas lines. Always verify markings with utility maps and call before digging.