Electricity Flashcards
Define and give examples of static electricity. (4)
Static electricity is the build up of electrons on an insulator. (1)
Balloon on Hair (1)
Balloon on Jumper (1)
Balloon on a Wall (1)
Define current electricity. (1)
Electricity that moves from one place to another. (1)
True or False:
The flow of conventional current and the flow of electrons are opposite. (1)
True (1)
Distinguish between an electrical conductor and an
electrical insulator. (2)
Conductors are materials which allow electrical current to flow through them easily. Metals are generally good electrical conductors. (1)
Insulators are materials which are poor conductors and do not allow electrical current to flow through them easily. (1)
Identify the common circuit symbols and draw a circuit
diagram correctly.
PPT 52 - 53
Compare series and parallel circuits. (2)
Parallel circuits are a type of circuit where: Voltage is the same everywhere. (1) and where current is shared. (1)
Series circuits are a type of circuit where: Voltage is shared (1) and current is the same everywhere. (1)
Define voltage and state its units. (2)
Voltage (potential difference ) is a measure of the difference in energy between two parts of a circuit. The bigger the difference in energy, the bigger the potential difference. (1)
It is measured in volts. (1)
Define current and state its units. (2)
Current is a measure of how much electrical charge that flows through a circuit. The more charge that flows, the bigger the current. (1)
It is measured in amps. (1)
Correctly set up and record the current and voltage in
both a series and parallel circuit. (2)
Ammeters are placed in series. (1) Voltmeters are placed in parallel. (1)
Define resistance, state its units.
Do conductors have a relatively low resistances compared to
insulators? (3)
Resistance is the opposition in an electrical component to the current flowing though it. (1)
Resistance is measured in ohms. Ω (1)
Yes. (1)
What is an LDR and how does it work in a circuit, in low or
strong light. (2)
LDRs (light-dependent resistors) are used to detect light levels, for example, in automatic security lights. (1)
Their resistance decreases as the light intensity increases (1)
Does charge always take the easiest route? (1)
Yes. (1)
Does a diode (an electronic component) only allow electric current to pass through it in one
direction? (1)
Yes. (1)
Explain what a light emitting diode (LED) is and how it
works. (2)
A light-emitting diode (LED) is a special kind of diode that glows when electricity passes through it. (1)
In common with all diodes, the LED will only allow current to pass in one direction. (1)
Understand the role of switches. (1)
Switches allow current to flow through them when the contacts inside are joined together. (1)
