Download SNC1P Electricity Review

SNC1D Electricity Review
PART A: Static Electricity
1. List the parts of the atoms, with their respective charges.
Particle
Charge
2. What particle can move from atom to atom?
3. What does “static” mean?
4. Two substances are rubbed together. One becomes positively charged, and one becomes negatively charged.
 What did the positive item lose?
 What did the negative item gain?
5. A negatively charged rod is held close to neutrally charged paper bits. What happens to the paper bits? What
rule predicts that this will happen?
6. What is the difference between a conductor and an insulator?
7. When each of the following pairs of items is rubbed together, show which one will take a positive charge (+) and
which one will take a negative charge (-). Use the static electric series to figure it out.
a) ebonite and silk
b) wool and glass
c) copper and plastic
d) rubber and paraffin wax
e) human hair and a rubber balloon
Why does hair stand on end, and separate, after being
charged with a balloon?
The Electrostatic Series
acetate
WEAK HOLD
glass
(+)
wool
cat’s fur, human hair
Ca, Mg, Pb
silk
Al, Zn
cotton
paraffin wax
ebonite
plastic
C, Cu, Ni
rubber
S
STRONG HOLD
Pt, Au
(-)
PART B: Current Electricity.
1.
2.
What is the difference between static electricity and current electricity?
What are the 2 methods that electric charge can be passed from one item to another? How does each
work?
3. Define the following terms, and explain each using the “runners on a track” analogy.
current
voltage
resistance
4. What units are used to measure current, voltage, and resistance?
5. If voltage is kept the same, and resistance is increased, what will happen to the current of a circuit?
6. Draw a closed series circuit with the following features: a cell, connecting wires, two light bulbs, a switch, a
fuse, and a resistor. Show how you would properly connect and ammeter anywhere in the circuit, and show how you
would properly connect a voltmeter to read the potential difference across the resistor. Also show the direction
of electron flow.
7. What is the difference between a series and a parallel circuit? Draw one of each to illustrate your answer.
8. What is the resistance of a circuit that has a current of 6A and a potential difference of 10V?
9. What is the purpose of the ground wire in home electricity?
10. What is a short circuit?
11. What is meant by the term “power”? What units are used to measure power?
12. Solve the following equations for power using the formulae
P=E/t
P=IV
a) What is the power of an appliance that converts 140 J of energy every 13s ?
b) A current of 24 A passes through your hairdryer when it is connected to a 110V outlet. What is the power of
the hairdryer?
13. Use the following formulae to answer the questions.
I=Q/T
V=E/Q
R=V/I
a) In a circuit, 56 C of charge passes a point in 4.5 s. What is the current?
b) In a circuit with a current of 7.8 A, how long will it take for 23 C of charge to pass a point?
c) How many volts of potential are found in 34 C of charge with 457 J of energy?
d) If a group of electrons with 35 C of charge has an electric potential of 5 V, how many joules of energy does the
group of electrons have?
e) The potential difference across a resistor is 4.5 V and the current through it is 2.4 A. What is its resistance?
14.
If a circuit carries a charge of 150 C if it is measured for 3 minutes, what is the current in the circuit?
15.
If a circuit has a known amount of 150 J when the potential difference is 6.0 V, what is the charge in the
circuit?
16.
If a series circuit is known to have a resistance of 24 ohms when a current of 6 A is put through it, what is
the potential difference in the circuit?
17.
Draw circuit diagrams for the following:
a)
a battery, a switch , a lamp - with a voltmeter measuring the potential difference of the lamp
b)
a cell, a toaster and a switch - with an ammeter measuring the current in the toaster
c)
a parallel circuit that has a cell, a switch and a lamp in the first loop and a power drill in the 2 nd loop
18. If someone is living “off grid”, what does that mean and what are their options?