Junior cert Science
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What type of circuit can be found in the home | Ring circuit
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| How are lighting and ring circuits, series or parallel | Parallel
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| what do you call a thin piece of wire that heats up and melts when a current above a certain value passes through it | Fuse
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| If a circuit has a current of 7A passing through it, what fuse should be used | 10A
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| What do you call the modern devices that house use now instead of fuses | Circuit breakers
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| What colour is the positive live wire | Brown
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| What colour is the negative neutral wire | Blue
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| What colour is the earth wire | Green and Yellow
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| What is the purpose of the earth wire | It is a safety wire that carries live current to the ground if required
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| Why should you never overload a circuit | can cause a fire
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| What is the unit of electrical power | watt (W)
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| What is the watt a measure of | How quickly an appliance converts electrical energy to other forms of energy
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| What is the ESB unit of electricity | kilowatt hour (kWh)
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| How would you calculate the number of kilowatt hours used | Number of kilowatts * number of hours
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| How would you calculate the cost of electricity | Number of units * cost per unit
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| What is a direct current (d.c.) | current that travels in one direction only
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| What is an alternating current (a.c.) | Current that changes direction many times per second, like the ESB supply
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| How can alternating current be converted to direct current | Using a rectifier
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| If an immersion heater has a power rating of 2000W, what is it rating in kW | 2kW
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| If a 2kW heater is left running for 6 hours, how many units of electricity does it use | 12units
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| If electricity costs 15c per unit, what does it cost to run the heater that uses 2 units every hour, if it is running for 6hours | 0.15x2x6= 1.80
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To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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Created by:
gcu science
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