1. Define the term closed circuit: A closed circuit is a working circuit that has been
switched on and has electricity running through it
2. Identify the part of an electrical circuit in which electrical energy is changed into
other useful forms of enegy: A light bulb is an example of electrical energy being
converted into light.
3. Explain why metals are better conductors of electricity than non-metals: This is
because in metals the electrons aren’t as strongly bonded to the nuclei. Whether as in
insulators the electrons and the nuclei are stuck together
4. Explain why a 50-watt globe glows more brightly than a 25-watt globe: A 50-watt
globe will glow more than a 25-watt because a 50-watt has more capacity fore energy to
flow through.
5. Identify what takes place inside a battery to cause an electric current to flow: A
chemical reaction occurs within the battery that is converted in to electrical energy
6. Outline why lithium-ion batteries are more commonly used in laptops and
mobiles: They supply 3.6v which is double that of your regular AA alkaline battery. Plus
they are still smaller and can be recharged.
7. Explain why it is important to have circuit symbols that are recognised by
scientists and electricians around the world: This may be important so we can
clearly understand circuits. It is also possible that this is a quicker method that actually
sketching the circuit
8. Identify which of the following arrangements will allow the globe to light up. Only
A. The problems with C,B and D are as follows. C) Is not properly connected at one of
the wires. B) Is missing one wire, if the electricity can’t flow out it won’t flow at all. D) Is
not going to work because the globe is not connected through a wire
9. A circuit is set up as illustrated below. A) If globe A is taken out, B and C will keep
glowing B) If Globe B is taken out only A will keep glowing C) If Globe C is taken out
only A will keep glowing.