LAS Electronic (Grade 10) MELC 2 Q2 Week-2

Electronics Activity Sheet
Quarter 2 - MELC 2
Week 2
Electrical Charges
Activity Sheet No. 2 - Electrical Charges
First Edition, 2020
Published in the Philippines
By the Department of Education
Region 6 - Western Visayas
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This Learning Activity Sheet is developed by DepEd Region 6 - Western
ALL RIGHTS RESERVED. No part of this learning resource may be
reproduced or transmitted in any form or by any means electronic or mechanical
without written permission from the DepEd Regional Office 6 – Western Visayas.
Development Team of Electronics Activity Sheet
Federico B. Barrera
Federico B. Barrera
Schools Division Quality Assurance Team:
Judy B. Dunton, Armida F. Dela Cruz,
Lorena D. Panuncio, Joanah V. Rojo,
Joebert D. Dorado
Schools Division of Capiz Management Team:
Salvador O. Ochavo, Jr.
Nicasio S. Frio
Segundina F. Dollete
Shirley A. De Juan
Andres D. Quiachon
Regional Management Team:
Ma. Gemma M. Ledesma,
Josilyn S. Solana,
Elena P. Gonzaga,
Donald T. Genine,
Rovel R. Salcedo,
Moonyeen C. Rivera,
Anita S. Gubalane,
Minda L. Soldevilla,
Daisy L. Lopez,
Joseph M. Pagalaran
Introductory Message
Welcome to STE Electronics 10!
The Learning Activity Sheet is a product of the collaborative efforts of the
Schools Division of Capiz and DepEd Regional Office VI - Western Visayas through
the Curriculum and Learning Management Division (CLMD). This is developed to
guide the learning facilitators (teachers, parents and responsible adults) in helping the
learners meet the standards set by the K to 12 Basic Education Curriculum.
The Learning Activity Sheet is self-directed instructional materials aimed to
guide the learners in accomplishing activities at their own pace and time using the
contextualized resources in the community. This will also assist the learners in
acquiring the lifelong learning skills, knowledge and attitudes for productivity and
For learning facilitator:
The Electronics Activity Sheet will help you facilitate the leaching-learning
activities specified in each Most Essential Learning Competency (MELC) with minimal
or no face-to-face encounter between you and learner. This will be made available to
the learners with the references/links to ease the independent learning.
For the learner:
The Electronics Activity Sheet is developed to help you continue learning
even if you are not in school. This learning material provides you with meaningful and
engaging activities for independent learning. Being an active learner, carefully read
and understand the instructions then perform the activities and answer the
assessments. This will be returned to your facilitator on the agreed schedule.
Name of Learner:
Grade and Section:
___________________________________Date: ________________
Electrical Charges
Learning Competency
Apply the relationship charge = current x time to new situations or to solve related
Background Information for Learners
In an emergency room of a hospital, a physician is trying to revive the life of a patient
using a defibrillator. A defibrillator is a device that gives a high energy electric shock to the
heart of someone who is in cardiac arrest. This high energy shock is called defibrillation,
which need a large amount of current to restore the heart beat that has already stopped.
Electric current is defined as the rate at which charge flows through a surface (the
cross section of a wire, for example). A large current is like the energy needed to start a
truck engine, whereas a small current is like an energy needed to operate a hand-held
calculator. This means that in the truck a large amount of charge moves over a short period
of time, while in a calculator, a small amount of charge moves over a long period of time.
Mathematically, it is expressed as:
I is current
q is charge
t is time
The unit of current is the ampère (A), which is named for the French scientist AndréMarie Ampère (1775–1836). In written languages, it has become customary to write the unit
as ampere.
Electric charge, (q), on the other hand, is carried by particles called electrons. One
electron has a very tiny negative charge and so for practical measurement of electric charge
coulombs (C) is used as a unit. Since charge is measured in coulombs and time is measured
in seconds, an ampère is the same as a coulomb per second (1A = 1C/s).
Every electron has a charge of 1.602176634 × 10−19 C. Reciprocally, the number of
electrons needed to produce a coulomb of charge is 6.2415 x 1018 e.
A current of one ampere is then the transfer of approximately 6.2415 × 1018 electron charges
per second.
In summary, I = q/t. Rearranging the equation yields q = (I) (t); and, t = q/I
You may meet smaller currents than one ampere. For these currents use milliamps
and microamps.
1 A = 1000 milliamp (mA)
1 A = 1 000 000 microamps ((A)
Figure 1. Electric Current
Direction of Flow
of Charge
The more charges that flow through the cross-section of the wire per
unit time, the greater is the current.
Activity Proper
ACTIVITY: Counting the passing “monggo” current.
Materials needed:
20 cm long drinking straw
40 – 50 pieces monggo beans
a ballpen or marker
cell phone with a stop watch/timer
1. Place the straw flat on a table and put a line mark at the center of the straw.
2. Fully fill the straw with monggo seeds in such a way that when you pop one monggo seed
at one end, a different monggo seed should pop out at the other end.
3. Now, pop in 30 monggo seeds one by one through the fully loaded straw and record the
time to do it on the table below.
Table 1. Record of the number of “ monggo” current.
Total number of monggo Time to pop in 30 monggo “Monggo” current
seeds that passed through seeds through the straw
(Number of monggo passing
the marked middle portion of
at the center per second)
the straw
Guide questions
1. What do the monggo seeds represent in this activity?
2. What does the straw represent in this activity?
3. How did you compute for the “monggo” current?
Additional II
Directions. Study how the following problems are solved.
Sample problems
1. A charge of 16 Coulomb passes through the filament of a car headlamp bulb in 4
seconds. What is the current?
Answer: Current = Charge/time = 16 C/4s = 4C/s = 4 A
2. A current of 0.5 ampere flows for 15 seconds through a small electric motor. How much
charge has passed?
Answer: Charge = Current x time = 0.5 A x 15s = 7.5C
Going a little Further
Directions. Answer the following problems. Show your computation on a separate sheet.
1. What is the current in milliamperes produced by the solar cells of a pocket calculator
through which 4.00 C of charge passes in 4.00 h?
2. A defibrillator passes 12.0 A of current through the torso of a person for 0.0100 s.
How much charge moves? (b) How many electrons pass through the wires connected
to the patient?
3.. A large lightning bolt had a 20,000-A current and moved 30.0 C of charge. What
was its duration?
1. An electron has an extremely low charge but the aggregation of many electrons over a short
period of time may result to a potentially dangerous electric charge. Relate this statement to
the saying, “There is strength in numbers”.
2. How could you possibly protect yourself from large amount of current?
Answer Key
ACTIVITY 1: Counting the passing “monggo” current.
Table 1. Record of the number of “ monggo” current.
Total number of monggo Time to pop in all 30 monggo “Monggo” current
seeds that passed thru the seeds thru the straw
(Number of monggo passing
marked middle portion of the
at the center per second)
on the speed of the learner)
(answer may vary depending
on the speed of the learner)
30 monggo seeds
20 seconds
30 monggo seeds/20
= 1.5 monggo
Guide questions:
1. The monggo seeds represent the electrons ( charges) flowing through the wire.
2. The straw represents the wire through which the electrons (charges) passes
3. I computed for the “monggo” current by dividing the total number of monggo seeds that
passed thru the marked middle portion of the straw with the time to pop in all 30 monggo
seeds thru the straw
Additional Activity
1. 0.278 mA
2. a) 0.120 C (b) 7.50 × 1017 electrons
3. 1.50 x10 -3 s
VII. Other References
Giancoli, Douglas C. 2007 Physics Principles with Applications (p493 - 497) Pearson