Statement 1A cell or battery provides Alternating Current (A.C.).

Statement 2The current provided by the mains is Direct Current (D.C.).

Statement 3Direct Current (D.C.) remains constant with time.

Statement 4Alternating Current (A.C.) changes its magnitude and polarity with time.

Statement 5The frequency of A.C. used in households is typically 60 Hz.

Statement 6In a 50 Hz A.C. supply, the polarity changes 100 times in one second.

Statement 7Potential difference is defined as the work done in moving a unit charge from one electrode to another.

Statement 8The unit of potential difference is the Ampere.

Statement 9Current is defined as the rate of flow of charges.

Statement 10The unit of current is the Volt.

Statement 11Electric power is the product of potential difference and current (P = VI).

Statement 121 Watt is equal to 1 Volt multiplied by 1 Ampere.

Statement 13Electric power is generated at the power station at 220 V.

Statement 14Voltage is raised to 132 kV for transmission to reduce energy loss due to heating.

Statement 15The voltage supplied to a house from the city substation is 220 V.

Statement 16The cable supplying power to a house consists of only two wires: live and neutral.

Statement 17The neutral wire is maintained at a potential of 220 V.

Statement 18The live wire carries current from the source to the appliance.

Statement 19The earth wire is used to provide a return path for the current.

Statement 20The neutral and earth wires are at the same potential (0 V) at the local substation.

Statement 21A transformer can increase or decrease D.C. voltage.

Statement 22The live wire is usually insulated with red or brown color.

Statement 23The neutral wire is insulated with green or yellow color.

Statement 24The earth wire is insulated with green or yellow color.

Statement 25A company fuse (pole fuse) is connected in the neutral wire.

Statement 26The company fuse has a high rating, such as 50 A.

Statement 27The kWh meter measures the power of appliances.

Statement 28The main fuse in a house circuit is connected to the live wire.

Statement 29The main switch disconnects only the live wire.

Statement 30The commercial unit of electrical energy is the Kilowatt-hour (kWh).

Statement 311 kWh is equal to 3.6 x 10^5 Joules.

Statement 32An electric meter is also known as a kWh meter.

Statement 33An electric fuse limits the voltage in a circuit.

Statement 34A fuse wire is made of an alloy of lead and tin.

Statement 35A fuse wire should have a high melting point.

Statement 36A 15 A fuse wire is thinner than a 5 A fuse wire.

Statement 37Heating of the fuse wire depends on its length.

Statement 38An ordinary copper wire can be used as a fuse wire.

Statement 39A Miniature Circuit Breaker (MCB) switches off the circuit in case of a short circuit.

Statement 40A short circuit occurs when the live wire touches the neutral wire.

Statement 41When a fuse melts, it breaks the continuity of the neutral wire.

Statement 42Household electrical appliances are connected in series.

Statement 43In a parallel connection, if one appliance fails, others continue to work.

Statement 44Appliances in a household circuit work at different voltages.

Statement 45In a series connection, if one bulb fuses, the other bulbs stop glowing.

Statement 46The metallic body of an appliance is connected to the live wire.

Statement 47Earthing protects the user from electric shock.

Statement 48Overloading occurs when a circuit draws less current than it is designed for.

Statement 49Power rating of an appliance includes its power and voltage.

Statement 50The safe limit of current is calculated as I = P / V.

Question 1The electricity produced by charges in motion is called ______ electricity.

Question 2The electricity where charges remain at rest is known as ______ electricity.

Question 3A cell or battery provides ______ current which remains constant with time.

Question 4The mains supply and electric generators provide ______ current.

Question 5The frequency of alternating current (A.C.) generally used is ______ Hz.

Question 6In a 50 Hz A.C. supply, the polarity changes ______ times in each second.

Question 7Potential difference is defined as the ______ done in moving a unit charge from one electrode to another.

Question 8The unit of potential difference is the ______.

Question 9Current is defined as the rate of flow of ______ in a unit time.

Question 10The unit of current is the ______.

Question 11Electrical power is calculated as the product of potential difference and ______.

Question 121 Watt is equal to 1 Volt multiplied by 1 ______.

Question 13Electric power is usually generated at the generating station at ______ kV.

Question 14Voltage is raised to ______ kV for transmission to reduce energy loss.

Question 15At the city substation, the voltage is reduced to ______ V for consumer supply.

Question 16The cable supplying power to a house consists of three wires: live, neutral, and ______.

Question 17The neutral and earth wires are connected together at the local substation so they are at ______ potential.

Question 18The live wire is also called the ______ wire.

Question 19The live wire carries current from the source to the distribution board at ______ volts.

Question 20A.C. voltage is raised up or lowered down using a ______.

Question 21______ voltage can neither be increased nor decreased by a transformer.

Question 22The colour of the insulation on the live wire is red or ______.

Question 23The colour of the insulation on the neutral wire is black or ______.

Question 24The earth wire has insulation of green or ______ colour.

Question 25The neutral wire provides the ______ path for the current.

Question 26To connect the cable from the pole to the meter, a fuse of high rating called the ______ fuse is used.

Question 27The main fuse is connected to the ______ wire.

Question 28The main switch is connected to both the live and ______ wires.

Question 29The commercial unit of electrical energy is the ______.

Question 30The unit kWh is also known as the ______ unit.

Question 311 kilowatt hour is the energy consumed when an appliance of 1 kW is used for ______ hour(s).

Question 321 kWh is equal to ______ Joules.

Question 33The electric meter is also called the ______ meter.

Question 34The rotating part of the kWh meter is called the ______.

Question 35An electric ______ is a safety device used to limit current in a circuit.

Question 36A fuse safeguards the circuit against voltage fluctuations or ______.

Question 37The fuse wire is made of an alloy of lead and ______.

Question 38The material of a fuse wire must have a ______ melting point.

Question 39A fuse with a higher current rating uses a ______ wire.

Question 40An ordinary copper wire must not be used as a fuse because its ______ is too high.

Question 41A short circuit occurs when the live wire comes in contact with the ______ wire.

Question 42In modern households, a ______ is used instead of a fuse as an automatic switch.

Question 43The MCB switches off the circuit in nearly ______ milliseconds during a short circuit.

Question 44The fuse wire is always connected in ______ with the live wire.

Question 45When a fuse wire melts, a ______ is produced in the live wire, breaking the circuit.

Question 46In a household circuit, all appliances are connected in ______.

Question 47In a parallel connection, each appliance works at the ______ voltage.

Question 48In a ______ connection, if one bulb fuses, the others also stop glowing.

Question 49In a parallel circuit, if one appliance fails, the others continue to work ______.

Question 50The metallic outer body of an appliance is connected to the ______ wire.

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