Basic Electronics Lab

E is Voltage – measured in Volts (V) E = I / R = P / I I is Current – measured in Amperes (Amps) (A) I = E / R = P / E R is Resistance – measured in Ohms () R = E / I = P / E2 P is Power – measured in Watts (W) P = E x I = I2 x R = E2 / R Series circuit:

Current through all is the same RTOTAL = R1 + R2 + R3 + … Parallel circuit:

Voltage across all is the same RTOTAL = 1 / (1 / R1 + 1 / R2 + 1 / R3 + …) Determine the resistance and wattage of each lamp at 12 VDC. Voltage Current Resistance Power Small Lamp 1 (1)_______ (1)_______ (2)_______ (2)_______ Small Lamp 2 (1)_______ (1)_______ (2)_______ (2)_______ Large Lamp 1 (1)_______ (1)_______ (2)_______ (2)_______ Large Lamp 2 (1)_______ (1)_______ (2)_______ (2)_______

1. Read on power supply display. 2. Calculation from voltage and current.

Determine the resistance and wattage of the two small lamps in parallel at 12 VDC. Voltage Current Resistance Power Both Small Lamps (1)_______ (1)_______ (2)_______ (2)_______ Determine the resistance and wattage of the two large lamps in series at 12 VDC. Voltage Current Resistance Power Both Large Lamps (1)_______ (1)_______ (2)_______ (2)_______

1. Read on power supply display. 2. Calculation from voltage and current.

Determine mathematically the values for a large and small lamp in series and then measure it. Voltage Current Resistance Power Math in combination (3)_______ (4)_______ (2)_______ (4)_______ Math of small lamp (6)_______ (5)_______ (1)_______ (6)_______ Math of large lamp (6)_______ (5)_______ (1)_______ (6)_______

1. Copy resistance of small lamp and large lamp measured above. 2. Combination resistance is sum of small lamp and large lamp measured above. 3. Combination voltage remains 12 VDC. 4. Calculate combination current and power. 5. Series current is the same for all in the circuit. 6. Calculate voltage and power for each lamp.

Voltage Current Resistance Power Measure combination (1)_______ (1)_______ (2)_______ (2)_______ Measure small lamp (1)_______ (1)_______ (2)_______ (2)_______ Measure large lamp (1)_______ (1)_______ (2)_______ (2)_______

1. Measuring voltage and current for combination and each lamp. 2. Calculate the resistance and power for the combination and each lamp.

High Power Components Lab

Battery fully charged open circuit is greater than 12.6 V Battery fully discharged open circuit is 11.8 V % of charge is approximately (V – 11.8) / (12.6 – 11.8) Voltage % charge Battery #1 (1)_______ (2)_______ Battery #2 (1)_______ (2)_______ Battery #3 (1)_______ (2)_______

1. Measuring voltage. 2. Calculate from voltage.

Identify the correct spade, butt splice, or eye connector for different wire sizes and crimp one to a wire. Solder two wires together and heat-shrink the connection. Small sprocket gear ratio – 3 up speed Large sprocket gear ratio – 1.5 up speed Calculate torque at capstan Radius of capstan in inches x weight in ounces (1)______ x (2)______ = (3)______

1. Measure diameter with caliper and divide by 2. 2. 16 ounces in a pound. 3. Multiply 1 by 2.

Calculate torque at motor Capstan torque * gear ratio (up speed) Small sprocket (1)____________ Large sprocket (2)____________

1. Multiply (3) from above by 3. 2. Multiply (3) from above by 1.5.

Determine speed in RPM from the Motor Curve No load: Small sprocket ________ Large sprocket ________ With load: Small sprocket ________ Large sprocket ________

1. Find torque on the x axis. 2. Go up to the speed line and read speed on y axis.

Calculate speed in inches per second No load: Small sprocket ________ Large sprocket ________ With load: Small sprocket ________ Large sprocket ________

1. Convert RPM to inches / second (RPM x 60 sec/min / gear ratio) x radius of capstan in inches x 3.14159

Measure speed and compare to calculated speed above No load: Small sprocket ________ Large sprocket ________ With load: Small sprocket ________ Large sprocket ________

1. Divide distance in inches by time in seconds

Kit of Parts Lab

Main Circuit Breaker Open and close the main circuit breaker

Power Distribution Board

Remove and insert a circuit breaker Remove and insert a wire

Digital Sidecar Identify the parts of the digital sidecar

Spike controller

Observe and interpret status lights Victor / Jaguar controller

Observe and interpret status lights

Troubleshooting Lab

Use the Digital Multi-meter to troubleshoot When power is off troubleshoot with ohm setting When power is on troubleshoot with DC voltage setting

Identify good and open fuses Locate broken wire Locate bad crimp Locate chaffing short Identify section of wire that is bad Look for chaffed insulation on shorted section