Physics
Grade-9
Easy
Question
In a series connection of resistors, what happens to the current across each resistor?
- Increases
- Decreases
- Remain the same
- Initially increases and then decreases
Hint:
In a series circuit, all the components are arranged in a single line. In a parallel circuit, all the components are arranged parallel to each other.
The correct answer is: Remain the same
- In a series circuit, all the components are arranged in a single line. In a parallel circuit, all the components are arranged parallel to each other. If more than one resistor is connected in series, the voltage across each resistor is not the same though the current flow is the same throughout the circuit.
- The amount of current in a series circuit is the same through any component in the circuit. This is because there is only one path for current flow in a series circuit.
- The current flowing through each resistor is same when connected in series.
Related Questions to study
Physics
30 Joules of energy enter a light bulb. 20 joules of energy are transformed into light, how much energy is dissipated as heat?
30 Joules of energy enter a light bulb. 20 joules of energy are transformed into light, how much energy is dissipated as heat?
PhysicsGrade-9
Physics
The total resistance in a circuit is equal to the sum of the inverse of each individual resistance.
The total resistance in a circuit is equal to the sum of the inverse of each individual resistance.
PhysicsGrade-9
Physics
Total resistance is the algebraic sum of the resistance across each resistor in
Total resistance is the algebraic sum of the resistance across each resistor in
PhysicsGrade-9
Physics
Total voltage is the sum of the voltage across each resistor in
Total voltage is the sum of the voltage across each resistor in
PhysicsGrade-9
Physics
An oven consumes 425 kWh of energy in order to provide 386 kWh of useful energy. What is its percent efficiency?
An oven consumes 425 kWh of energy in order to provide 386 kWh of useful energy. What is its percent efficiency?
PhysicsGrade-9
Physics
Your heating system is 55 percent energy-efficient. What amount of energy would it consume to transform 9000 kWh into useful thermal energy for heating the house during the winter?
Your heating system is 55 percent energy-efficient. What amount of energy would it consume to transform 9000 kWh into useful thermal energy for heating the house during the winter?
PhysicsGrade-9
Physics
A television that is 83% efficient provides 6000 J of useful energy. How much energy does it consume?
A television that is 83% efficient provides 6000 J of useful energy. How much energy does it consume?
PhysicsGrade-9
Physics
Some homes are still heated by hot water boiler furnaces. The components of the system are an oil tank, a furnace, water pipes and radiators. The furnace burns the oil from the storage tank. The heat released is used to heat water which is then pumped to radiators throughout the house. A diagram is shown below.
If all the heat from the combustion was used to heat the water, the system would be 100% efficient. However, some heat is lost in the furnace exhaust and some is lost from the pipes delivering the water to the radiators.
One litre of oil delivers 48 000 kJ of energy. 7 600 kJ are lost to the exhaust, and 900 kJ are lost in transporting the hot water to the radiators. Determine the efficiency of this heating system.
Some homes are still heated by hot water boiler furnaces. The components of the system are an oil tank, a furnace, water pipes and radiators. The furnace burns the oil from the storage tank. The heat released is used to heat water which is then pumped to radiators throughout the house. A diagram is shown below.
If all the heat from the combustion was used to heat the water, the system would be 100% efficient. However, some heat is lost in the furnace exhaust and some is lost from the pipes delivering the water to the radiators.
One litre of oil delivers 48 000 kJ of energy. 7 600 kJ are lost to the exhaust, and 900 kJ are lost in transporting the hot water to the radiators. Determine the efficiency of this heating system.
PhysicsGrade-9
Physics
A simple diagram of a Hydro-Electric System is shown below
why all the energy from the water flowing into the turbine is not transformed into electrical energy.
A simple diagram of a Hydro-Electric System is shown below
why all the energy from the water flowing into the turbine is not transformed into electrical energy.
PhysicsGrade-9
Physics
An electrician installs patio lights in a back yard. Which of the following will decrease the efficiency of the wiring system to the back yard?
1- Bury the extension cord very deep down underground.
2- Use a short extension cord.
3- Use a long extension cord.
4- Use compact fluorescent light bulbs
An electrician installs patio lights in a back yard. Which of the following will decrease the efficiency of the wiring system to the back yard?
1- Bury the extension cord very deep down underground.
2- Use a short extension cord.
3- Use a long extension cord.
4- Use compact fluorescent light bulbs
PhysicsGrade-9
Physics
20 joules of energy are transformed into light, how much energy is dissipated as heat out of 40J given in.
20 joules of energy are transformed into light, how much energy is dissipated as heat out of 40J given in.
PhysicsGrade-9
Physics
Which glows brighter?
Which glows brighter?
PhysicsGrade-9
Physics
Total current is the sum of the current across each resistor in
Total current is the sum of the current across each resistor in
PhysicsGrade-9
Physics
Total current is the same across each resistance in
Total current is the same across each resistance in
PhysicsGrade-9
Physics
Your heating system is 45 percent energy efficient. The total useful output energy is 9000 kWh.
Changing the insulation would increase your house to 85 percent energy efficient. The cost to change the insulation is 131776 Rs. The cost of heating is 7 Rs/ kWh. How much time will it take to recover your investment?
Your heating system is 45 percent energy efficient. The total useful output energy is 9000 kWh.
Changing the insulation would increase your house to 85 percent energy efficient. The cost to change the insulation is 131776 Rs. The cost of heating is 7 Rs/ kWh. How much time will it take to recover your investment?
PhysicsGrade-9
