Electricity
What causes electrostatic forces?
A property of an object called charge, charged objects
What causes Magnetic Forces?
Moving Charges
What is a solenoid?
A coil of wire carrying current which produces a magnetic field similar to a bar magnet
Ohms, represented by the greek symbol Ω (Omega)
What is the current in a piece of a circuit, that has a resistance of 10 ohms and a voltage of 15 volts?
1.5 Amps, 1.5 A
What is a rule that represents the interaction between charged objects?
Opposites attract, Likes Repel
What is a rule that represents the relationship between magnetic poles?
Opposites attract, Likes Repel
How is energy converted from one form to another in electrical generator:
Mechanical energy is converted to electrical energy
Which way does conventional current flow in a DC circuit?
From positive to negative, + to -
If the voltage across a circuit is 6 volts and the current flowing through it is 2 amperes, what is the resistance of the circuit?
3 Ohms
When an object gains electrons, its charge becomes more
What are magnetic domains?
Regions within a material where the magnetic moments are aligned
How is energy converted from one form to another in an electric motor:
Electrical energy is converted to mechanical energy
Describe Ohm's Law and what it is used for:
V=IR, It is used to relate / calculate voltage, current or resistance from the other two.
Calculate the power through a given component if the voltage is 10V and the current is 5 Amps.
P =VI, 50 W or 50 Watts
What is electric polarization?
When a strongly charged object separates the charges of a neutral object creating an effective charge
How are temporary magnets different from permanent ones?
The domains in temporary magnets return to random alignment after the magnetizing force is removed
What is electromagnetic induction?
A process in which changing a magnetic field can induce an electric current in a conductor.
Describe Node Law:
Node law is one of Kirchhoff's laws of circuits which says that the current into any node is equal to the current out of the node.
Given a series circuit with two resistors, one of 9Ω and one of 6Ω, and a battery powering the circuit of 30 Volts, what is the voltage drop across each resistor?
18 V, and 12 V
What are three ways you can charge an object?
Electromagnetic Induction, Holding a charged object near the object allowing it polarize it, Charging by Friction, Rubbing an object to try and gain the other objects electrons and Charging by Conduction, Touching a charged objects and allowing the electrons to flow from one body to the other.
What must you do to make a magnetic material a magnet?
Align its magnetic domains using an external magnetic field
How can the strength of an electromagnet be increased?
Increasing current or by increasing the number of turns of the coil.
Describe Loop Law:
For every current loop, the voltage up from the power supply is equal to the voltage down from the resistors.
Given a parallel circuit with two resistors, one of 3Ω and one of 9Ω, and a battery that powers the circuit of 180 Volts, what is the total current coming from the battery?
80A