**Electric Current and its Effect**

Electric current is the flow of electric charge through a conductor. It is a basic concept in physics and plays a crucial role in our daily lives. Understanding electric current and its effects is important to comprehend various electrical phenomena and their applications.

**Definition and Measurement of Electric Current:**
Electric current is defined as the rate of flow of electric charge. It is measured in amperes (A) using an ammeter. One ampere is equivalent to the flow of one coulomb of charge per second. The direction of current is considered as the direction of positive charge flow, opposite to the actual movement of electrons.

**Effects of Electric Current:**
Electric current has several effects, including:

1. **Heating Effect:** When an electric current passes through a conductor, it generates heat due to resistance. This effect is utilized in appliances like electric heaters, toasters, and incandescent bulbs.

2. **Magnetic Effect:** Electric current creates a magnetic field around the conductor. This property is utilized in various devices such as electromagnets, electric motors, and transformers.

3. **Chemical Effect:** Electric current can cause chemical changes in certain substances. This effect is utilized in electroplating, electrolysis, and various chemical processes.

4. **Physiological Effect:** Electric current passing through the human body can have physiological effects, ranging from tingling sensations to severe injuries or even death. Safety precautions such as insulated wiring and proper grounding are crucial to prevent accidents.

**Applications of Electric Current:**
Electric current and its effects find numerous applications in our everyday life:

1. **Power Generation and Distribution:** Electric current is used to generate electricity in power plants and is distributed to homes, industries, and institutions for various purposes.

2. **Electronics and Telecommunications:** The principles of electric current are the foundation of electronics and telecommunications. Devices such as computers, smartphones, radios, and televisions operate based on electric currents.

3. **Transportation:** Electric current is used in electric vehicles and trains for propulsion. It enables the charging of batteries and the operation of electric motors.

4. **Lighting:** Electric current powers various lighting systems, including incandescent bulbs, fluorescent lamps, and LEDs.

In conclusion, electric current and its effects are fundamental concepts in science. Understanding their principles and applications is crucial to comprehend the functioning of electrical devices and systems.

The full form of MCB is miniature circuit breakers and the seventeenth question says wrong.It says it is multiple circuit breaker???