Basic Electricity - Senior Secondary 1 - Battery charging I

TERM: 3^RD TERM

WEEK NINE

Class: Senior Secondary School 1

Age: 15 years

Duration: 40 minutes of 5 periods each

Date:

Subject: BASIC ELECTRICITY

Topic: BATTERY CHARGING I

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

I.)  Identify materials and equipment for battery charging

II.) State the methods of battery charging

III.) State the precautions required in a charging room

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures,

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

NOTE

BATTERY CHARGING I

Materials and equipments for battery charging

Materials, tools, and equipment used for battery charging:

1. Battery Charger: A device specifically designed to provide the necessary voltage and current to charge batteries safely.
2. Power Source: A stable AC power supply is typically used to power the battery charger.
3. Charging Cables: Insulated cables with appropriate connectors to connect the battery charger to the battery terminals.
4. Safety Equipment: Personal protective equipment such as gloves, goggles, and aprons to protect against accidental contact with electrolyte or battery acid.
5. Battery Maintenance Equipment: Tools for checking battery voltage, electrolyte levels, and specific gravity, such as voltmeters, hydrometers, and battery load testers.

Methods of battery charging

1. Constant Voltage Charging: This method maintains a constant voltage across the battery terminals while allowing the charging current to vary. It is commonly used for charging lead-acid batteries.
2. Constant Current Charging: In this method, a constant current is supplied to the battery until it reaches its maximum voltage. It is commonly used for charging lithium-ion batteries.
3. Pulse Charging: Pulse charging involves charging the battery with short bursts of high-current pulses followed by rest periods. It is often used for rejuvenating or conditioning batteries that have been deeply discharged or sulfated.
4. Trickle Charging: Trickle charging involves charging the battery at a very low rate, typically just enough to offset self-discharge. It is used for maintaining fully charged batteries over extended periods without overcharging.
5. Fast Charging: Fast charging delivers a high current to the battery to reduce charging time. However, it requires careful monitoring to prevent overheating and damage to the battery.

Precautions required in a charging room

1. Ensure the charging room is equipped with fire extinguishers and fire suppression systems in case of battery fires or electrical fires.
2. Install proper ventilation systems to remove gases emitted during charging and prevent the buildup of explosive concentrations.
3. Prohibit smoking, open flames, or sparking equipment in the charging area to prevent ignition of flammable gases.
4. Require personnel to wear appropriate PPE such as gloves, goggles, and aprons to protect against accidental contact with battery acid or electrolyte.
5. Regularly inspect charging equipment, cables, and batteries for signs of damage or wear and tear. Replace any damaged components immediately to prevent accidents.
6. Establish clear emergency procedures and ensure all personnel are trained on how to respond to battery-related incidents such as fires, leaks, or spills.

EVALUATION: 1. Mention 5 instruments and equipment used for battery charging

2. State 4 safety precautions required in a charging room
3. Mention 3 methods of battery charging you know

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively