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Electricity Unit
Circuits and Stuff
34
Physics
03/22/2012

Term
 The motion of charges in wires, motors, light bulbs and other devices is best called:
Definition
 Electric Current
Term
 Schematic Diagram
Definition
 Uses symbols to represent each part of the circuit, can be interpreted by anyone, and makes drawing easier
Term
 Open Circuit
Definition
 A circuit with a break
Term
 Name two devices used to measure current
Definition
 Voltmeter; ammeter
Term
 Two devices that protect circuits from overloading
Definition
 Circuit breakers and fuses
Term
 What is Ohm's law?
Definition
 The relationship between current, voltage, and the resistance
Term
 When more devices are added to a series circuit, the total resistance _________
Definition
 Increases
Term
 As you add more light bulbs in a series circuit, the light bulbs become ______________
Definition
 Dimmer
Term
 The voltage is the same in what kind of circuit?
Definition
 Parallel
Term
 What is the same everywhere in a series circuit?
Definition
 Currrent
Term
 Adding a new branch to a parallel circuit _______________ the resistance of the circuit
Definition
 Increases
Term
 Series Circuits
Definition
 Only one pathway for the electrical current to travel through
Term
 Parallel Circuits
Definition
 More than one pathway for the electrical current to travel through
Term
 Houses are wired in __________________
Definition
 Parallel Circuits
Term
 What is this? All current flowing into a branch point must exit again
Definition
 Kirchhoff's Law (for parallel circuits)
Term
 Energy from an electrical company is bought in ______________
Definition
 Watts
Term
 The direction of current is DEFINED as going from _____ to _____
Definition
 positive to negative
Term
 Where do electrons come from besides the battery?
Definition
 The Wires
Term
 Describe an insulator's electrons.
Definition
 They are tightly bound and fixed in place
Term
 Define Capacitor
Definition
 A device that stores electrical energy
Term
 Cut a bar magnet in half and what happens?
Definition
 You have two magnets
Term
 What do like poles in a magnet do if they touch?
Definition
 They repel
Term
 Where are magnetic field lines strongest at?
Definition
 Where the lines converge
Term
 When are magnetic fields created?
Definition
 When current pases through a wire.
Term
 How do you demagnetize a permanent magnet?
Definition
 Messing up the alignment of its magnetic field's domains
Term
 List three ways to increase the strength of an electromagnet
Definition
 1) Wrap the wire around an iron core2) Increase the number of coils3) Add more voltage (add batteries)
Term
 What will a compass needle do when placed next to a wire containing current?
Definition
 It will line up with the direction of the current
Term
 What is a commutator?
Definition
 This switches the electromagnets from north to south and back again on an electric motor
Term
 A motor converts:
Definition
 Electrical energy to mechanical energy
Term
 What does an electric generator produce?
Definition
 Electrical energy
Term
 Define Electromagnetic Induction
Definition
 When current is induced in a wire by a moving magnet
Term
 A generator converts:
Definition
 Mechanical energy to electrical energy
Term
 What happens to the strength of the field when you get farther away from it?
Definition
 It diminishes it
Term
 What creates an electric field?
Definition
 The friction of charged particles
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