Answer :
Final answer:
A measurement of 0.0 kW-hrs does not mean that the grinder uses no energy overall. It could be due to various reasons such as the grinder being turned off or not being used during that time. To accurately assess the grinder's energy usage, a measurement and average of its energy consumption over a period of time is needed.
Explanation:
Your labmate's claim that the grinder uses no energy because it measured 0.0 kW-hrs is not accurate. It is important to understand that 0.0 kW-hrs means that no energy was used in that specific instance, but it doesn't imply that the grinder uses no energy overall. A measurement of 0.0 kW-hrs could be due to various reasons, such as the grinder being turned off or not being used during that time. In order to properly assess the energy usage of the grinder, you would need to measure and average its energy consumption over a period of time. This would give a more accurate representation of its energy usage.
