Electric Circuits
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Questions and Answers

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

  • Amperes
  • Volts
  • Watts
  • Ohms (correct)
  • What is the purpose of a voltmeter in an electric circuit?

  • To measure the current flowing in the circuit
  • To measure the resistance of the load
  • To measure the voltage across the load (correct)
  • To measure the emf of the battery
  • Which component is always connected in series to the load in an electric circuit when measuring current?

  • Ohmmeter
  • Ammeter (correct)
  • Multimeter
  • Voltmeter
  • What is the function of a multimeter in an electric circuit?

    <p>To measure the voltage, current, and resistance</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 length of time the current flows through the body</p> Signup and view all the answers

    What is the maximum current that can be fatal in an electric shock?

    <p>50 mA</p> Signup and view all the answers

    What should you do if someone is shocked or burned by electricity and is still in contact with the live circuit?

    <p>Switch off the electrical supply and call for help</p> Signup and view all the answers

    What is the recommended action if you cannot find the electrical supply source when someone is shocked or burned by electricity?

    <p>Do not touch the victim</p> Signup and view all the answers

    Which of the following is NOT one of the learning objectives for the unit on Electrical Safety?

    <p>Explain the two types of electric shock: Direct contact and Indirect contact</p> Signup and view all the answers

    Which of the following is NOT a type of electric shock?

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

    What is the purpose of a multimeter in electrical work?

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

    Which of the following is NOT one of the sub-units in the section on Electrical Principles and Circuits?

    <p>Electrical Test Instruments</p> Signup and view all the answers

    Which formula can be used to calculate the total resistance of a series circuit with two resistors?

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

    In a series circuit, the total resistance is higher than the highest individual resistance.

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

    In a parallel circuit, the total resistance is lower than the lowest individual resistance.

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

    What is the total resistance of a parallel circuit with two resistors, where $R1 = 80 , \Omega$ and $R2 = 160 , \Omega$?

    <p>$34.29 , \Omega$</p> Signup and view all the answers

    According to Ohm's law, the current flowing through a conductor is directly proportional to the potential difference applied across its ends, provided the temperature remains constant. Which equation represents Ohm's law?

    <p>$V = I \times R$</p> Signup and view all the answers

    What is the formula to calculate the voltage in a circuit, given the current and resistance?

    <p>$V = I \times R$</p> Signup and view all the answers

    In a simple electric circuit, a load of resistance 500 Ω is connected to a supply of 230 V. What is the current drawn?

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

    In a series circuit comprising two resistors, what is the formula to calculate the total resistance?

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

    What is the power dissipated in a 10 Ω resistor connected to a voltage of 220 V?

    <p>4.84 kW</p> Signup and view all the answers

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

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

    What is the energy consumption of an electrical load with a power of 50 W, in kilowatt-hours?

    <p>0.05 kWh</p> Signup and view all the answers

    Which equation represents the conversion between kilowatt-hours and joules?

    <p>1 kWh = 3.6 × 10^7 J</p> Signup and view all the answers

    What is the electrical energy used by a 1,000 W heater turned on for 10 hours?

    <p>360,000 J</p> Signup and view all the answers

    What is the energy consumed by a 2 kW refrigerator turned on for 24 hours per day in one month (30 days)?

    <p>1440 kWh</p> Signup and view all the answers

    What is the cost of using a refrigerator at $0.25 per unit if it consumes 1440 kWh?

    <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 are the three main components of an energy bill in Singapore?

    <p>electricity, gas, water</p> Signup and view all the answers

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