Question

Fill in the blanks

1. Electrical devices can do the job of mechanical devices (more,less) ____ quickly and efficiently.
2. When a component uses less than one or two volts for operation, it is ___.
3. A(n) ___ is a conventional component that uses electricity to do work.

Answer 1

Electrical devices are typically faster and more efficient than mechanical ones, a component with operation under one or two volts is considered low-voltage, and an actuator uses electricity to perform work. Power is measured in watts and denotes how quickly energy is used rather than the duration a device is on.

Step-by-step explanation:

1. Electrical devices can do the job of mechanical devices more quickly and efficiently due to the inherent speed and precision of electrical systems, which can be manipulated almost instantaneously and tailored through electronic circuits.

2. When a component uses less than one or two volts for operation, it is low-voltage. These components are designed to work with a minimal electric potential, making them suitable for small, sensitive electronic devices or low-power applications.

3. A(n) actuator is a conventional component that uses electricity to do work. It converts electrical energy into mechanical force or motion, fulfilling the same purpose as mechanical devices but typically with greater control and efficiency.

Power in electrical appliances is measured in watts, which represents the rate at which energy is consumed or converted into another form. The wattage rating doesn't change based on how long a device is on; a device only consumes power when it's active. However, total energy consumption is often expressed in kilowatt-hours, a unit that measures energy usage over time, making it easier to calculate for billing and comparison purposes.

A spark of static electricity carries a high power level but lasts for a very short time and with a very small total energy, which is why it doesn't injure you. Additionally, the current and voltage in such a static discharge are not sufficient to cause harm to the human body.

Answer 2

The correct answers are: 1. more, 2. low-voltage, 3. electrical appliance. Electrical appliances are rated in watts and the rating reflects power consumption during operation, not duration. Static electricity sparks are not harmful due to their brief duration, limiting energy transfer.

Step-by-step explanation:

1. Electrical devices can do the job of mechanical devices more quickly and efficiently.
2. When a component uses less than one or two volts for operation, it is low-voltage.
3. A(n) electrical appliance is a conventional component that uses electricity to do work.

Most electrical appliances are rated in watts. This rating does not depend on how long the appliance is on; it indicates the power consumption when the device is in operation. Energy consumption is sometimes listed in kilowatt-hours rather than joules because it is a more convenient unit for measuring the amounts of energy typical in household consumption; one kilowatt-hour is equivalent to 3.6 million joules.

A static electric spark can carry a few hundred watts of power but does not injure you due to the extremely short duration of exposure, meaning that the total energy transferred is quite small.