Podcast
Questions and Answers
Which of the following is the correct unit of measurement for resistance in an electric circuit?
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?
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?
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?
What is the function of a multimeter in an electric circuit?
Which of the following is a factor that determines the severity of injury from an electric shock?
Which of the following is a factor that determines the severity of injury from an electric shock?
What is the maximum current that can be fatal in an electric shock?
What is the maximum current that can be fatal in an electric shock?
What should you do if someone is shocked or burned by electricity and is still in contact with the live circuit?
What should you do if someone is shocked or burned by electricity and is still in contact with the live circuit?
What is the recommended action if you cannot find the electrical supply source when someone is shocked or burned by electricity?
What is the recommended action if you cannot find the electrical supply source when someone is shocked or burned by electricity?
Which of the following is NOT one of the learning objectives for the unit on Electrical Safety?
Which of the following is NOT one of the learning objectives for the unit on Electrical Safety?
Which of the following is NOT a type of electric shock?
Which of the following is NOT a type of electric shock?
What is the purpose of a multimeter in electrical work?
What is the purpose of a multimeter in electrical work?
Which of the following is NOT one of the sub-units in the section on Electrical Principles and Circuits?
Which of the following is NOT one of the sub-units in the section on Electrical Principles and Circuits?
Which formula can be used to calculate the total resistance of a series circuit with two resistors?
Which formula can be used to calculate the total resistance of a series circuit with two resistors?
In a series circuit, the total resistance is higher than the highest individual resistance.
In a series circuit, the total resistance is higher than the highest individual resistance.
In a parallel circuit, the total resistance is lower than the lowest individual resistance.
In a parallel circuit, the total resistance is lower than the lowest individual resistance.
What is the total resistance of a parallel circuit with two resistors, where $R1 = 80 , \Omega$ and $R2 = 160 , \Omega$?
What is the total resistance of a parallel circuit with two resistors, where $R1 = 80 , \Omega$ and $R2 = 160 , \Omega$?
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?
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?
What is the formula to calculate the voltage in a circuit, given the current and resistance?
What is the formula to calculate the voltage in a circuit, given the current and resistance?
In a simple electric circuit, a load of resistance 500 Ω is connected to a supply of 230 V. What is the current drawn?
In a simple electric circuit, a load of resistance 500 Ω is connected to a supply of 230 V. What is the current drawn?
In a series circuit comprising two resistors, what is the formula to calculate the total resistance?
In a series circuit comprising two resistors, what is the formula to calculate the total resistance?
Which formula can be used to determine the power in an electric circuit comprising one electrical load?
Which formula can be used to determine the power in an electric circuit comprising one electrical load?
What is the power dissipated in a 10 Ω resistor connected to a voltage of 220 V?
What is the power dissipated in a 10 Ω resistor connected to a voltage of 220 V?
What is the rated current and resistance of a 60 W, 230 V bulb?
What is the rated current and resistance of a 60 W, 230 V bulb?
What is the energy consumption of an electrical load with a power of 50 W, in kilowatt-hours?
What is the energy consumption of an electrical load with a power of 50 W, in kilowatt-hours?
Which equation represents the conversion between kilowatt-hours and joules?
Which equation represents the conversion between kilowatt-hours and joules?
What is the electrical energy used by a 1,000 W heater turned on for 10 hours?
What is the electrical energy used by a 1,000 W heater turned on for 10 hours?
What is the energy consumed by a 2 kW refrigerator turned on for 24 hours per day in one month (30 days)?
What is the energy consumed by a 2 kW refrigerator turned on for 24 hours per day in one month (30 days)?
What is the cost of using a refrigerator at $0.25 per unit if it consumes 1440 kWh?
What is the cost of using a refrigerator at $0.25 per unit if it consumes 1440 kWh?
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?
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?
What are the three main components of an energy bill in Singapore?
What are the three main components of an energy bill in Singapore?
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