52 Questions
True or false: An electric shock occurs when an electrical current flows through the human body.
True
True or false: Direct contact occurs when a person comes into contact with a conductor that is live under normal conditions.
True
True or false: Indirect contact occurs when a person comes into contact with exposed conductive parts that have become live under fault conditions.
True
True or false: A shock current of 50 mA can be fatal.
True
True or false: A damaged electrical cord can cause a fatal electric shock.
True
True or false: An ammeter is always connected in series to the load in the circuit.
True
True or false: A voltmeter is used for measuring the resistance of an electrical load in the circuit.
False
True or false: When using an ohmmeter to measure resistance, the power should be switched on.
False
A multimeter is a device that can measure voltage, current, and resistance.
True
There are three types of circuits: series circuit, parallel circuit, and series-parallel circuit.
True
Ohm's law states that the current (I) flowing through a conductor is inversely proportional to the potential difference (V) applied across its ends.
False
In a series circuit, the total resistance is equal to the sum of all individual resistances.
True
Power is the rate of doing work.
True
The unit of power is joule.
False
The formula to determine power in an electric circuit is P = V × I.
True
The practical unit of energy consumption in a household is kilowatt-hour (kWh).
True
True or false: The higher the power rating, the less energy an appliance consumes?
False
True or false: Setting the air conditioner to a lower temperature will reduce power consumption?
False
True or false: Replacing incandescent light bulbs with energy-saving bulbs will save electricity?
True
True or false: In a series circuit, the total resistance is always higher than the highest individual resistance in the circuit.
True
True or false: In a parallel circuit, the total or equivalent resistance is always lower than the lowest individual resistance in the circuit.
True
True or false: In a series circuit, the supply voltage is equal to the sum of all the individual voltages.
False
True or false: In a parallel circuit, the supply current is equal to the sum of all individual branch currents.
True
True or false: Home Automation Systems are covered in the Smart Electrical Technology course?
True
True or false: Electrical Test Instruments are used to measure power consumption in an electric circuit?
False
True or false: Home Automation Systems utilize wireless network and radio frequency for communication?
True
True or false: Home Automation Controllers are not required for basic networking and installing relevant mobile apps?
False
True or false: An ohmmeter is used for measuring the emf of the battery?
False
True or false: The symbol for an ammeter is A?
True
True or false: The force required to cause the current to flow in a closed circuit is called resistance?
False
True or false: A voltmeter is always connected in series to the load in the circuit?
False
True or false: The severity of injury from an electric shock depends on the amount of current flowing through the body and the length of time the current flows through the body.
True
True or false: Good housekeeping in the workplace can lower the risk of accidents and fire, improve productivity, make better use of space, and reflect a well-managed operation.
True
True or false: In order to work safely, it is important to switch off the power before working on a circuit.
True
True or false: Direct contact occurs when a person comes into contact with a conductor that is live under normal conditions.
True
True or false: Power is the rate of doing work?
True
True or false: Energy is defined as the capacity to perform work?
True
True or false: The power dissipated in a 1,000 Ω resistor is 50 W.
True
True or false: The cost of electrical energy is calculated by the product of energy consumed in kWh and the rate per unit?
True
True or false: In a series circuit, the supply voltage is equal to the sum of all the individual voltages?
True
True or false: A digital multimeter uses an indicator needle with a measurement scale.
False
True or false: The total or equivalent resistance of a parallel circuit is equal to the reciprocal of the sum of the reciprocals of the individual resistances?
True
True or false: Ohm's law states that the current (I) flowing through a conductor is directly proportional to the potential difference (V) applied across its ends, provided the temperature remains constant.
True
True or false: The total resistance of a parallel circuit is always lower than the lowest individual resistance in the circuit?
True
True or false: The formula derived from Ohm's law is V = I × R, where V is in volts (V), I is in amperes (A), and R is in ohms (Ω).
True
True or false: In a series circuit, the total resistance is always higher than the highest individual resistance in the circuit?
True
True or false: In a parallel circuit, the total resistance is equal to the sum of all individual resistances.
False
True or false: The higher the power rating, the more energy an appliance consumes?
True
True or false: Making energy-efficient choices allows us to save electricity and money without compromising on our quality of life?
True
True or false: Setting the air conditioner to about 25 °C reduces power consumption?
True
True or false: Replacing incandescent light bulbs with energy-saving compact fluorescent bulbs or LED bulbs saves electricity?
True
True or false: Switching off the lights when you leave a room reduces energy consumption?
True
Study Notes
Electrical Safety
- An electric shock occurs when an electrical current flows through the human body.
- Direct contact occurs when a person comes into contact with a conductor that is live under normal conditions.
- Indirect contact occurs when a person comes into contact with exposed conductive parts that have become live under fault conditions.
- A shock current of 50 mA can be fatal.
- A damaged electrical cord can cause a fatal electric shock.
Measurement Instruments
- A multimeter is a device that can measure voltage, current, and resistance.
- An ammeter is always connected in series to the load in the circuit.
- A voltmeter is used for measuring the voltage in an electric circuit.
- An ohmmeter is used for measuring the resistance of an electrical load in the circuit, but the power should be switched off when using it.
Circuits
- There are three types of circuits: series circuit, parallel circuit, and series-parallel circuit.
- In a series circuit, the total resistance is equal to the sum of all individual resistances.
- In a parallel circuit, the total or equivalent resistance is always lower than the lowest individual resistance in the circuit.
- In a series circuit, the supply voltage is not equal to the sum of all individual voltages.
- In a parallel circuit, the supply current is equal to the sum of all individual branch currents.
Power and Energy
- Power is the rate of doing work.
- The unit of power is watt (W).
- The formula to determine power in an electric circuit is P = V × I.
- The practical unit of energy consumption in a household is kilowatt-hour (kWh).
- Energy is defined as the capacity to perform work.
- The cost of electrical energy is calculated by the product of energy consumed in kWh and the rate per unit.
Household Energy Efficiency
- Making energy-efficient choices allows us to save electricity and money without compromising on our quality of life.
- Replacing incandescent light bulbs with energy-saving compact fluorescent bulbs or LED bulbs saves electricity.
- Switching off the lights when you leave a room reduces energy consumption.
- Setting the air conditioner to about 25 °C reduces power consumption.
Other
- Ohm's law states that the current (I) flowing through a conductor is directly proportional to the potential difference (V) applied across its ends, provided the temperature remains constant.
- The formula derived from Ohm's law is V = I × R, where V is in volts (V), I is in amperes (A), and R is in ohms (Ω).
- Good housekeeping in the workplace can lower the risk of accidents and fire, improve productivity, make better use of space, and reflect a well-managed operation.
- In order to work safely, it is important to switch off the power before working on a circuit.
Test your knowledge on power and energy in electric circuits with this quiz. Learn about the definitions of power and energy, as well as the units of measurement for each. Practice applying the formulas to determine power and energy in various electric circuits.
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