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Electric Circuits
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Electric Circuits

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Questions and Answers

Which of the following is the unit of measurement for voltage in an electric circuit?

  • Watt
  • Ohm
  • Ampere
  • Volt (correct)

    • Which component is used to measure the current flowing in an electric circuit?

  • Voltmeter
  • Ammeter (correct)
  • Ohmmeter
  • Multimeter

    • What is the symbol used to represent resistance in an electric circuit?

  • Ω (correct)
  • V
  • I
  • A

    • Which device can measure voltage, current, and resistance in an electric circuit?

    <p>Multimeter</p> Signup and view all the answers

    Which of the following is a factor that determines the severity of injury from an electric shock?

    <p>The voltage of the electric shock</p> Signup and view all the answers

    Which of the following is a safe work practice when working with electrical circuits?

    <p>Using and maintaining tools properly</p> Signup and view all the answers

    Which of the following is a recommended safety precaution when handling and using measuring instruments?

    <p>Exercising caution when handling live wires</p> Signup and view all the answers

    What is the unit of measurement for current?

    <p>Ampere (A)</p> Signup and view all the answers

    Which type of electric shock occurs when a person comes into contact with a conductor that is live under normal conditions?

    <p>Direct contact</p> Signup and view all the answers

    What are the two types of electric shock mentioned in the text?

    <p>Direct contact and indirect contact</p> Signup and view all the answers

    What are the learning objectives related to electrical safety mentioned in the text?

    <p>All of the above</p> Signup and view all the answers

    What is the purpose of using a multimeter in electrical work?

    <p>To test for electrical continuity</p> Signup and view all the answers

    Which formula can be used to determine the power in an electric circuit comprising one electrical load?

    <p>P = V × I</p> Signup and view all the answers

    What is the resistance of the other resistor if the supply current is 0.33 A and the supply voltage is 100 V?

    <p>769.23 Ω</p> Signup and view all the answers

    What is the rated current and resistance of a 60 W, 230 V bulb?

    <p>0.26 A, 884.62 Ω</p> Signup and view all the answers

    What is the power dissipated in a 1,000 Ω resistor connected to a voltage of 220 V?

    <p>4840 W</p> Signup and view all the answers

    According to Ohm's law, what is the relationship between current, resistance, and voltage?

    <p>Voltage is directly proportional to current and inversely proportional to resistance</p> Signup and view all the answers

    In a simple electric circuit, if the current is 0.5 A and the resistance is 20 Ω, what is the voltage?

    <p>10 V</p> Signup and view all the answers

    In a circuit with a load of 500 Ω and a supply voltage of 230 V, what is the current drawn?

    <p>0.46 A</p> Signup and view all the answers

    In a circuit with a current of 0.2 A and a resistance of 50 Ω, what is the supply voltage?

    <p>20 V</p> Signup and view all the answers

    Which one of the following formulas can be used to calculate the total resistance in a series circuit?

    <p>$RT = R1 + R2$</p> Signup and view all the answers

    In a parallel circuit, the total resistance is equal to the reciprocal of the sum of the reciprocal of individual resistances. Which one of the following formulas represents this relationship?

    <p>$\frac{1}{RT} = \frac{1}{R1} + \frac{1}{R2}$</p> Signup and view all the answers

    In a series circuit, if the individual resistances are known and the total resistance is known, which one of the following formulas can be used to calculate the supply current?

    <p>$IS = \frac{VS}{RT}$</p> Signup and view all the answers

    In a parallel circuit, if the individual resistances are known and the total resistance is known, which one of the following formulas can be used to calculate the supply current?

    <p>$IS = \frac{VS}{RT}$</p> Signup and view all the answers

    Which of the following is the formula for calculating electrical energy?

    <p>Energy = Power x Time</p> Signup and view all the answers

    A 1,000 W heater is turned on for 10 hours. What is the electrical energy used in joules?

    <p>3,600,000 J</p> Signup and view all the answers

    A 2 kW refrigerator is turned on for 24 hours per day. What is the energy consumed in kilowatt-hours in one month (30 days)?

    <p>1,440 kWh</p> Signup and view all the answers

    What is the cost of using the refrigerator for one month (30 days) at a rate of $0.25 per unit?

    <p>$360</p> Signup and view all the answers

    What is the total energy consumed by a 1,000 W heater for 30 days if it is turned on for an average of 10 hours per day?

    <p>300 kWh</p> Signup and view all the answers

    What is the bill for using the 1,000 W heater for 30 days if the rate of energy is $0.25 per unit?

    <p>$75</p> Signup and view all the answers

    Study Notes

    Electric Circuits and Safety

    • The unit of measurement for voltage in an electric circuit is the volt (V).
    • An ammeter is used to measure the current flowing in an electric circuit.
    • The symbol used to represent resistance in an electric circuit is the ohm (Ω).
    • A multimeter can measure voltage, current, and resistance in an electric circuit.
    • The severity of injury from an electric shock is determined by the voltage, current, and duration of the shock.

    Safety Precautions

    • A safe work practice when working with electrical circuits is to ensure the power is off before starting work.
    • A recommended safety precaution when handling and using measuring instruments is to follow the manufacturer's instructions.

    Electric Shock

    • Electric shock can be classified into two types: macrshock (direct contact with a live conductor) and microshock (indirect contact with a live conductor).

    Electrical Measurements

    • The unit of measurement for current is the ampere (A).
    • The power in an electric circuit comprising one electrical load can be determined using the formula P = VI, where P is the power, V is the voltage, and I is the current.
    • Ohm's law states that voltage (V) is equal to current (I) multiplied by resistance (R), or V = IR.

    Resistors and Circuits

    • The total resistance in a series circuit can be calculated using the formula Rt = R1 + R2 + ... + Rn, where Rt is the total resistance and R1, R2, ..., Rn are the individual resistances.
    • In a parallel circuit, the total resistance is equal to the reciprocal of the sum of the reciprocal of individual resistances, or 1/Rt = 1/R1 + 1/R2 + ... + 1/Rn.
    • The supply current in a series circuit can be calculated using the formula I = V/Rt, where I is the current, V is the voltage, and Rt is the total resistance.
    • The supply current in a parallel circuit can be calculated using the formula I = V/Rt, where I is the current, V is the voltage, and Rt is the total resistance.

    Energy and Cost

    • Electrical energy can be calculated using the formula E = Pt, where E is the energy, P is the power, and t is the time.
    • The cost of using electrical energy can be calculated by multiplying the energy consumed by the rate per unit.

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    Related Documents

    SET Textbook 2023 1-30.pdf

    Description

    This quiz tests your knowledge on power and energy in electric circuits. It covers topics such as defining power and energy, stating the units of power and energy, and solving circuit problems involving supply voltage and current. Get ready to apply your understanding of electrical technology and calculate current, resistance, and more.

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