Task 7 – Deal with Unplanned Events

This task requires you to describe suitable methods for dealing with unplanned events or unexpected situations.  

 Scenario:

During this assessment, you are measuring the circuit parameters. You notice that one of the circuit wires is beginning to melt on the workbench. What corrective actions should you take?

Task 5 – Modify existing circuit to comply with specified operating parameters.

The total current in the circuit needs to be reduced to approximately 62.5% of the original value. This will be done by changing the value of resistor R2.

Calculate:

1. the value of the replacement resistor - R NEW

62.5% of existing current

show your working here 

Answer. = mA

New Total circuit resistance

show your working here 

Answer. = Ω

New replacement for R2 = RT - R1

show your working here 

Answer. = Ω

2. the new total power dissipated by the circuit - PT NEW

show your working here 

Answer. = W

Use an ohmmeter to find a suitable replacement resistor from those provided. replace R2 and check your selection by measuring the circuit current.

Measured circuit current matches that in Q1.  = mA

Task 5 – Calculate unknown circuit parameters from measured values.

From the measured values in Task 4, determine the following circuit parameters by calculation.

1. Actual total resistance of resistors in series (R1 + R2)Actual

show your working here 

Answer. = Ω

2. Actual value of R2

show your working here 

Answer. = Ω

3. Actual value of R1

show your working here 

Answer. = Ω

4. Total power dissipated by the circuit (PT).

show your working here 

Answer. = W

5. Measured value of R2

show your working here 

Answer. = Ω

6. Measured value of R1

show your working here 

Answer. = Ω

Task 4 – Energise the DC circuit and take electrical measurements.

Switch on the power supply and adjust the output voltage to 12 volts. Measure the circuit parameters listed below and record your readings in the spaces provided

• Work within established safety procedures

• Accurately measure and record the circuit current

Your teacher will confirm your competency in each item listed above in the Skill Assessment checklist.

Adjust the power supply to 12V and record the following:

Switch open I _Supply = mA

Switch Closed I _Supply = mA

U_R2 = V

Task 3 – Construct a DC Circuit

Construct the circuit drawn in Task 2, connect it to the supply terminals but DO NOT ENERGISE. Make sure that WHS risk control work measures and procedures are followed.

You will be assessed on your ability to:

• Connect the circuit accurately using appropriate tools and equipment, whilst ensuring no damage to apparatus, circuits and the surrounding environment or services

• Check the tools and equipment for correct operation and safety

• Follow safe work procedures

• Work effectively with team members

• Work sustainably and minimise waste

Your teacher will confirm your competency in each item listed above by signing your diagram before you upload it.

 Your teacher is

Task 2: Draw a single path DC circuit.

On a clean piece pf paper, draw a circuit diagram of a DC series circuit consisting of two loads;

• a fuse labelled F1 to protect ALL equipment in the circuit (including meters)
• a single pole switch labelled S1 that controls the circuit
• two resistors labelled R1-10Ω and R2-15Ω
• an ammeter to measure total circuit current (show correct meter polarity)
• a voltmeter to measure supply voltage (show correct meter polarity)

Up load your drawing here. once you have completed all tasks after your teacher has signed you drawing.

Task 1 – Complete a Risk Assessment

Hierarchy of Control

The recommended code of practice outlines six steps for selecting the hierarchy of control.

When assessing potential solutions to reduce the potential of accidents, start with the first step and work your way through each option.

Following are the steps in order of application:

1: Elimination

2: Substitution

3: Isolation

4: Engineering

5: Administrative

6: Personal protective equipment.

 Assessment Declaration

• This assessment is my original work and no part of it has been copied from any other source except where due acknowledgement is made.

• No part of this assessment has been written for me by any other person except where such collaboration has been authorised by the assessor concerned.

• I understand that plagiarism is the presentation of the work, idea or creation of another person as though it is your own. Plagiarism occurs when the origin of the material used is not appropriately cited. No part of this assessment is plagiarised.

My assessor for this unit is .

A voltage of 12 V is applied to a resistor and the measured current is 150mA. Calculate:

a) The amount of resistance  Ohms.

b) The power dissipated by the resistor  

A voltage of 10V is applied to a 100 Ω resistor connected in a series circuit. Calculate the current that flows in the circuit: