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Test: Electric Circuits & Electrical Safety - Year 11 MCQ


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10 Questions MCQ Test - Test: Electric Circuits & Electrical Safety

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Test: Electric Circuits & Electrical Safety - Question 1

What is electrical current?

Detailed Solution for Test: Electric Circuits & Electrical Safety - Question 1
Current is the flow of electric charge around a circuit. The charge is carried by electrons which are emitted by the negative electrode of the cell and travel to the positive electrode of the cell through the circuit
Test: Electric Circuits & Electrical Safety - Question 2

What can be calculated from current-potential difference graphs?

Detailed Solution for Test: Electric Circuits & Electrical Safety - Question 2
The gradient gives the resistance
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Test: Electric Circuits & Electrical Safety - Question 3

What is the unit of current?

Detailed Solution for Test: Electric Circuits & Electrical Safety - Question 3
Amperes or Amps for short is the unit of current. It is usually denoted with an A after a value of current
Test: Electric Circuits & Electrical Safety - Question 4
What is the formula for potential difference?
Detailed Solution for Test: Electric Circuits & Electrical Safety - Question 4
V is in volts when W is in joules and Q is in coulombs
Test: Electric Circuits & Electrical Safety - Question 5
Which formula calculates the size of the current?
Detailed Solution for Test: Electric Circuits & Electrical Safety - Question 5
If you didn't remember the equation, you can work it out. Whenever you need to calculate the rate of something in physics, it is expressed as something per second. To get the 'per second' bit, you know that you need to divide by time. That eliminates two of the alternative answers so the one that works out the current must be the correct one
Test: Electric Circuits & Electrical Safety - Question 6
What is the work done in a circuit if the voltage is 10 V, the current is 4 A and the circuit is on for 25 seconds?
Detailed Solution for Test: Electric Circuits & Electrical Safety - Question 6
You need to rearrange the equation V = W⁄Q and work out the charge. Remember that one coulomb is one amp flowing for one second so if you have four amps flowing for 25 seconds, how many coulombs is that?
Test: Electric Circuits & Electrical Safety - Question 7
What does the size of the electric current depend on?
Detailed Solution for Test: Electric Circuits & Electrical Safety - Question 7
High currents = bigger flow rates
Test: Electric Circuits & Electrical Safety - Question 8
What is the unit of charge?
Detailed Solution for Test: Electric Circuits & Electrical Safety - Question 8
The coulomb is the unit of charge. It is denoted by a C after a value of charge and is named for the French scientist Charles-Augustin de Coulomb who carried out a lot of pioneering work on electrical charge and magnetism
Test: Electric Circuits & Electrical Safety - Question 9
What is the size of the current in a circuit if the charge, Q, is 100 C and lasts for 25 seconds?
Detailed Solution for Test: Electric Circuits & Electrical Safety - Question 9
Remember the definition - current is a measure of how much charge flows past a given point in one second. This should help you to get the right answer even if you can't recall the equation
Test: Electric Circuits & Electrical Safety - Question 10
What is potential difference?
Detailed Solution for Test: Electric Circuits & Electrical Safety - Question 10
Strictly speaking, it should really be called electrical potential difference but at GCSE, potential difference is acceptable, when used in the correct context
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