Electricity and Circuits - SS1 Physics Past Questions and Answers - page 4

To calculate the energy, we multiply the daily energy consumption by the number of days in a week.

Daily energy consumption = 800W × 3h = 2400Wh

Weekly energy consumption = 2400Wh × 7 days = 16,800Wh or 16.8 kWh.

To calculate the energy, we can use the formula E = P × t, where E is the energy, P is the power, and t is the time.

Plugging in the given values, we get E = 150W × 24h = 3,600Wh or 3.6 kWh.

It is important to wear insulated gloves and safety glasses when working with electrical circuits to protect oneself from potential hazards. When working with electricity, there is a risk of electrical shock or arc flash, which can cause serious injuries.

Insulated gloves provide a barrier between the hands and the electrical components, preventing direct contact with live wires and reducing the risk of electrical shock. Safety glasses, on the other hand, protect the eyes from any sparks, debris, or chemicals that may be released during electrical work, preventing eye injuries.

Proper grounding is essential in electrical circuits to ensure safety and protect against electrical faults. Grounding provides a safe path for excess electrical current to flow into the ground, preventing electrical shocks and fires. Without proper grounding, electrical faults such as short circuits or equipment malfunctions can cause electrical current to flow through unintended paths, such as the human body. This can result in severe injuries or even fatalities.