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Questions and Answers
What is the resistance and tolerance for each resistor shown?
What is the resistance and tolerance for each resistor shown?
To be determined based on circuit configuration.
In the circuit shown, the 10A fuse F1 blows when the value of R1 is:
In the circuit shown, the 10A fuse F1 blows when the value of R1 is:
- Less than 1.2 Ohms
- Less than 24 Ohms
- Greater than 2.4 Ohms (correct)
- Greater than 1.2 Ohms
How much is current I1 in the circuit shown when switch S1 is open?
How much is current I1 in the circuit shown when switch S1 is open?
- Zero A (correct)
- 100 A
- 1 mA
- infinite A (until a wire melts)
How much is current I1 in the circuit shown when switch S1 is closed?
How much is current I1 in the circuit shown when switch S1 is closed?
Reading from left to right, the colored bands on a resistor are yellow, violet, brown and gold. If the resistor measures 513 with an ohmmeter, it is:
Reading from left to right, the colored bands on a resistor are yellow, violet, brown and gold. If the resistor measures 513 with an ohmmeter, it is:
What, exactly, is a short circuit, and how does it differ from an open circuit?
What, exactly, is a short circuit, and how does it differ from an open circuit?
In the circuit, find iR3.
In the circuit, find iR3.
A 90A current flows into 4 resistors in parallel. The resistors are 5Ω, 6Ω, 12Ω, 20Ω. Find the current in each resistor.
A 90A current flows into 4 resistors in parallel. The resistors are 5Ω, 6Ω, 12Ω, 20Ω. Find the current in each resistor.
Calculate Vout for each circuit below, show your calculation.
Calculate Vout for each circuit below, show your calculation.
A 12V battery is rated at 100A-hours. How long can it supply a current of 20A?
A 12V battery is rated at 100A-hours. How long can it supply a current of 20A?
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Study Notes
Resistor Identification and Tolerance
- Identify the resistance and tolerance of each resistor.
- The tolerance of a resistor indicates the maximum acceptable deviation from its nominal value.
- Use the color code bands to find the resistance and tolerance.
Circuit Analysis with Fuses
- When a fuse blows, it interrupts the current flow to protect the circuit.
- The 10A fuse F1 blows when the value of R1 exceeds a certain value, which needs to be determined.
Switch-Controlled Current
- When switch S1 is open, no current flows through the circuit, thus I1 is zero.
- When switch S1 is closed, current flows through the circuit, and I1 has a certain value.
Resistor Measurement and Tolerance
- A resistor with bands of yellow, violet, brown, and gold represents 470 ohms with a 5% tolerance.
- The measured value of 513 ohms falls within the tolerance range of the resistor.
Circuit Short Circuit
- A short circuit allows current to flow through an unintended path with very low resistance.
- A shorted circuit can have extremely high current, potentially damaging components.
- An open circuit is the opposite of a short circuit. It is a break in the circuit that prevents current flow.
Circuit Current and Voltage
- Calculate the current through each resistor in a parallel circuit.
- Use Ohm's Law (V = I * R) to find the current in each resistor.
Battery Capacity and Discharge Time
- A battery's capacity is measured in amp-hours (Ah), representing the total charge it can store.
- A 12V battery rated at 100Ah can supply a current of 20A for 5 hours.
Circuit Connections - Practical Part
- Connect components in series and parallel configurations on a breadboard.
- Experiment with LEDs and resistors to understand current flow in different circuit arrangements.
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