Electronics Merit Badge Class 2 10/3/20151Electronics Merit Badge Class 2.

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Presentation transcript:

Electronics Merit Badge Class 2 10/3/20151Electronics Merit Badge Class 2

Resistance Resistance is an electrical property of a material that “resists” the flow of electrons. The schematic symbol for a resistor is: Common units for resistance are: – Ohms – Kilohm: 1K= 1000 ohms, 10K = 10,000 ohms – Megohm: 1M = 1,000,000 ohms The units symbol for ohms is: Ω (ohms) Electronics Merit Badge Class 2 10/3/20152

Current Current: Defined as “flow of electrons”. Current: Units of current is AMPS. Current: Electrical symbol for current is I. Common units for current are: – Amps – Milliamps (ma): 1 ma =.001 amp – Microamps (ua) : 1 ua = amp, or.001 ma – Nanoamps (na) : 1 na = amp or ma, or.001 ua. Electronics Merit Badge Class 2 10/3/20153

Voltage Volts is the electrical force that causes electrons (current) to flow. Units of volts is VOLTS. The symbol of volts is E or V. We will use V. Common units for voltage are: – Volts – Millivolt (mv) :.001 volt. – Microvolt (uv) : volt, or.001 mv – Nanovolt (nv) : volt, or mv, or.001 uv. Electronics Merit Badge Class 2 10/3/20154

Ohms Law One of the most important laws in electronics/electricity. V = I x R : Voltage = Current x Resistance Volts is measure in VOLTS, current is measured in AMPS, and resistance is measured in OHMS. 1 AMP, going through 1 OHM of resistance, generates a voltage drop of 1 VOLT. 1 V = 1 A x 1 Ω. Electronics Merit Badge Class 2 10/3/20155

More Ohm’s Law Volts = 10. Resistance = 1000Ω Compute current. I = V / R I = 10 / 1000 =.01A.01A = 10ma Question: what would the current be if the voltage was 1 V? How about 1000 V? Different forms of Ohm’s Law: V = I x R : Voltage = Current X Resistance I = V / R : Current = Voltage / Resistance R = V / I : Resistance = Voltage / Current 10V 1000 Ω Electronics Merit Badge Class 2 10/3/

Ohm’s Law Exercise Using a meter, we will measure some resistors. Then, using ohm’s law, we will calculate the resistor’s values. To do this, we will use the meter to measure current and voltage in a circuit. Electronics Merit Badge Class 2 10/3/20157

A B Meter Using the meter, measure current. I = _________ amps 000 Ohms Law – Step 1 SET METER TO DCA -20m +-

Meter 000 Using the meter, measure voltage. V = _________ volts Ohms Law – Step 2 SET METER TO DCV - 20

Ohms Law – Step 3 Calculate resistance from your 2 measurements. Ohms Law : V = I x R. Therefore, R = V / I <- Use this equation. Note: you will be measuring current on the 20ma range, so a value of 2.5ma needs to be written as.0025A when using this equation.

Meter 000 Using the meter, measure Resistance. R = _________ ohms Ohms Law – Step 4 How does this compare with your calculated value? SET METER TO Ω – 20k