10th Sep '25

Multiple Choice 2015-16

Question	Answer	Point
What is potential difference and what is it measured in?	Potential difference is the difference in energy between two parts of a circuit, and is measured in volts.	Potential difference is the difference in energy between two parts of a circuit, and is measured in volts.
What is electric current?	Electric current is the flow of charge and is measured in amperes. KS4: Add 'rate of' to definition and then define the coulomb.	Electric current is the flow of charge and is measured in amperes. KS4: Add 'rate of' to definition and then define the coulomb.
What charged particles are able to move in a metal?	The charged particles able to move in a metal are electrons. So in a metal, current is the flow of electrons.	The charged particles able to move in a metal are electrons. So in a metal current is the flow of electrons.
How can we describe current and how do we measure it?	Current is the amount of charge flowing around a circuit. We measure it using an ammeter placed in series in a circuit.	Current is measured using an Ammeter which must be placed in series in the circuit.
What do we use to measure potential difference and how must we do it?	Potential difference is measured using a Voltmeter which must be placed in parallel with a component.	Potential difference is measured using a Voltmeter which must be placed in parallel with a component.
What happens to current when branches in a circuit meet and why?	Charge can not be created, destroyed or be stored on a wire, therefore currents add where branches meet.	Charge can not be created, destroyed or be stored on a wire, therefore currents add where branches meet.
What is the store of energy in potential difference caused by?	Potential difference is a store of energy caused by the compressing of a charge particle's electric field.	Potential difference is a store of energy caused by the compressing of a charge particle's electric field.
What happens to the potential difference in a series circuit?	Potential differences in series add up, for example adding cells - direction important.	Potential differences in series add up, for example adding cells - direction important.
What happens if we don't match the potential difference ratings of the battery to the bulb in a circuit?	Battery and bulb (p.d.) ratings need to be matched otherwise too much energy transfer will cause the bulbs to melt.	Battery and bulb (p.d.) ratings need to be matched otherwise too much energy transfer will cause the bulbs to melt.
What are the rules for representing circuits in diagram form?	Circuits are represented by circuit diagrams in which: - Wires are drawn as straight lines - With component symbols - Right angle corners.	Circuits are represented by circuit diagrams in which: - Wires are drawn as straight lines - With component symbols - Right angle corners.
Which components symbols are important to know?	Component symbols to know - Cell - Battery - Wire - Bulb - Switch - Voltmeter - Ammeter	Component symbols to know - Cell - Battery - Wire - Bulb - Switch - Voltmeter - Ammeter
How are series circuits described?	Series circuits consist of only one branch with component placed one after another.	Series circuits consist of only one branch with component placed one after another.
How are parallel circuits described?	Parallel circuits consist of more than one branch.	Parallel circuits consist of more than one branch.
What is resistance and what is it measured in?	Resistance is a measure of how hard it is for current to flow through a material / set of components and measured in ohms,	Resistance is a measure of how hard it is for current to flow through a material / set of components and measured in ohms,
Why does resistance vary between conducting and insulating components?	The differences in resistance between conducting and insulating components can be explained by the amount of charged particles (and how much charge they hold) available to move. Conductors have more available charge carriers than insulators.	The differences in resistance between conducting and insulating components can be explained by the amount of charged particles (and how much charge they hold) available to move. Conductors have more available charge carriers than insulators.
What is resistance the ratio of?	Resistance is the ratio of potential difference (p.d.) to current.	Resistance is the ratio of potential difference (p.d.) to current.
What equation is used to calculate resistance?	To be able to calculate Resistance given a p.d. and current using R = V / i	To be able to calculate Resistance given a p.d. and current using R = V / i
How can the equation for resistance be rearranged to find potential difference or current?	To be able to calculate either a p.d. or current given the other and the resistance by rearranging R = V / i	To be able to calculate either a p.d. or current given the other and the resistance by rearranging R = V / i
What are electromagnets made of?	An electromagnets is consists of: - a coil - a current source - possibly an iron core	An electromagnets is consists of: - a coil - a current source - possibly a core
What are the main uses of electromagnets?	The main uses of electromagnets are: - Door bells - Transformers - Loudspeakers - Scrap magnets - MRI machines - Headphones	Uses of electromagnets: - Door bell - Relay
What factors can affect the strength of an electromagnet?	The factors that can affect the strength of an electromagnet are: - number of coils of wire - voltage - number of magnets	Electromagnets enquiry: Aim: To find out how the __________ affects the strength of an electromagnet.
ES - What is the motor effect?	The motor effect occurs when a magnetic field created by a flow of current interacts with a magnetic field from a permanent magnet.	The motor effect occurs when a magnetic field created by a flow of current interacts with a magnetic field from a permanent magnet.
ES - How is the motor effect used to create a speaker?	They do this by using an electromagnet held inside a permanent magnet's field. The electric current around the amplifier constantly changes, and in changing it also changes the magnetic field around the electromagnet. This causes changing attraction and repulsion between the two magnets making the electromagnet move backwards and forwards. This movement causes sound waves.	To use the motor effect to explain: - a 'ding dong' door bell. - Speaker

Mod	Number of Questions
0S	10
1B	10
1C	10
1P	10
BI	5