Static and Current Electricity
What sort of things are attracted to a positive charge?
Negative charges items and Neutral Items
Define potential difference
change in energy between 2 points. pressure to make electricity flow.
What type of energy transformation does a solar panel do?
Radiation to electrical
What is a battery?
two or more cells connected
What is the energy change in a motor?
electrical to mechanical (motion)
Differentiate between conductors and insulators
Conductors allow electron flow, insulators do not.
What is the resistance of a circuit if a 1.5 V cell is able to push 0.3 A of current?
5 Ohms
Name the most common type of waste energy in an energy transformation
Thermal store / Heat
Name the two essential pieces of an electrochemical cell
electrodes and electrolytes
What causes the current in a generator?
motion between wire and magnet
Which type of circuit one has one pathway for electrons?
Series Circuit
If a 3 ohm resistor has 2.5 amps of current running through it, then what voltage is pushing the current?
7.5 Volts
Name 3 things that turn electricity into light
examples include... light bulb, phone screens, stove elements.
If three 1.5 Volt cells are placed in series, what is the voltage?
4.5 Volts
Name three ways to make a motor more powerful
examples include... more loops of wire, stronger magnet, reduce distance between wire and magnets and more current
In a circuit diagram, what side of the cell is the shorter end?
negative end. source of electrons.
Name 4 things that affect the resistance of a wire
temperature, width (gauge), length, type of material
Describe the piezoelectric effect
when a mechanical force causes an electrical pathway of energy.
Differentiate between a primary and secondary cell
Secondary cells are rechargeable
What is the function of the split ring commentator in these devices?
switch direction of current in armature (thus the poles of electromagnet)
What is the function of a circuit breaker?
to stop flow of electricity in a home circuit when too much is flowing through.
If a 100 W light bulb is on for 5 hours. What is the cost for the electricity if the price is 8cents per kWh?
4 cents
Why does Alberta use oil and coal for energy when it is damaging to the environment?
easy to access, plentiful, cheap.
If the cells are placed in parallel, the voltage remains the same as a single cell, what is the advantage of placing the cells in parallel?
longer lasting.
What is the function of a step down transformer
Reduce Voltage