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Worksheets3gk - physics test
Total questions: 9
Worksheet time: 18mins
Tick off all the correct answers about efficiency!
Efficiency describes how much energy a machine needs to run
Efficiency describes which percentage of the energy cannot be used in a process
The efficiency of a LED is better than the one of a light bulb, when you use it for lighting a room
Thermal power stations have efficiencies around 30%
An electric car can have an efficiency of up to 150%
Why are high voltage transmission lines used to transmit electricity very far?
because the higher the voltage is, the fewer electricity is lost in the transmission lines.
because electricity can only be transmitted at very high voltages.
because it is a lot safer for the people and the environment to use high voltage
because you can transmit more electrical power in the same cables using high voltage
because with high voltage you don't need any transformers or electrical substations
What will stop working immediately after a black out?
fridge
mobile phone
washing machine
car
lighting in a room
What should you do during a black out?
steel things from the supermarket
listen to the radio (for example in your car)
prepare candles for the night
eat things that spoil quickly first
panik and run around
What can you do to prepare for a crisis, like a black out?
buy rice and other food that can be stored for a long time
check regularly if the medicaments are still good
talk with your family about different actions and procedures
always have enough candles and lighters in the house
buy a gas stove and enought gas
Tick off the correct statements about nerve cells and the human body
nerve cells connect the brain and muscles
when the brain sends and electrical pulse to a muscle the muscle contracts
When a muscle gets an electrical pulse it contracts
To help a person that is caught in a circuit you should grab the persons hand tightly and pull sharply
The potential between the inside and the outside of a nerve cell is about 50 Volts.
Tick off the correct sentences about electroscopes.
Electroscopes can be used to detect magnetic fields
similar charges attract each other, different charges repel
The more additionl electrons are on an electroscope the higher moves the pin inside the electroscope
when you touch an charged electroscope with your finger, most of the additional charges will flow into your finger
when you touch an charged electroscope with your finger, nothing will happen at all
Tick off the correct statements about power stations and transformers
Photovoltaik modules convert sunrays directly into electricity
Hydroelectric power stations use the wind to make electricity
Most power stations produce 3 phase electrical power
In Austria we produce a lot of hydroelectric power
You usually find photovoltaik modules on the roofs of houses
Tick off the correct statements about lightnings
most people survive a lightning strike
a lightning stike can blow off your robe
lightning stikes can cool down metals strongly
lightning stikes can split trees into halfs
when you're struck by a lightning you can get a runny nose, broken heart or even feel sorry for a stone.
