chapter 21 questions
Terms
undefined, object
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- WHAT IS THE FUNCTION OF A CIRCUIT BREAKER BOX?
- to protect against a fire caused by overloading circuits.
- WHAT DETERMINES THE AMOUNT OF ENERGY AN APPLIANCE USES?
- it's power rating and the number of circuits in your home.
- NAME ONE USE FOR A MATERIAL WITH HIGH RESISTANCE
- a filament in a lightbulb
- WHAT IS THE FUNCTION OF THE CARBON ROD THAT RUNS DOWN THE CENTER OF A DRY CELL?
- the chemical reaction
- WHAT CAUSES AREAS OF POSTIVE AND NEGATIVE CHARGES TO BUILD UP IN CLOUDS?
- friction from movement of water droplets.
- WHAT DOES AN ELECTROSCOPE DETECT?
- electric charges
- WHAT OBSERVATION ABUT CURRENT IN A METAL CONDUCTOR WAS THE BASIS FOR O'HMS LAW?
- current depends on resistance and potential difference.
- EXAMPLE OF A GOOD INSULATOR-
- wood
- NAME ONE THING THAT IS NECESSARY TO KEEP CURRENT FLOWING?
- an unbroken path for electrons to follow.
- WHAT IS ONE REASON SOME PEOPLE THINK LIGHTNING FIRES SHOULD BE ALLOWED TO BURN?
- fires are an important part of nature's cycle.
- EXPLAIN WHY A WHOLE STRING OF CHRISTMAS LIGHTS MAY NOT WORK IF ONE BULB BURNS OUT.
- the lights are wired together in a series circuit.
- WHICH DIRECTION DO ELECTRONS FLO?
- from objects with higher potential energy to those with lower potential energy.
- CONNECTING A CHARGED OBJECT TO EARTH IN ORDER TO DISCHARGE THE OBJECT INTO EARTH IS CALLED -
- grjounding
- WHICH WIRES HAVE THE LEAST AMOUNT OF ELECTRICAL RESISTANCE? long, fiberglass, hot or thick?
- thick
- AS THE DISTANCE FROM A CHARGED PARTICLE INCREASES, THE STRENGTH OF THE ELECTRIC FIELD---
- decreases
- STATIC ELECTRICITY
- the net accumulation of electric charges on an object
- THE DIFFERENCE IN ENERGY CARRIED BY ELECTRONS AT DIFFERENT POINTS IN A CIRCUIT WILL DETERMINE THE -
- voltage
- HOW DOES AN ELECTRON EXERT A FORCE ON ANOTHER CHARGED PARTICLE?
- by interacting with the particle's electric field.
- ELECTRICAL ENERGY IS MEASURED IN -
- kilowatt-hours
- THE DIFFERENCE IN POTENTIAL ENERGY PER CHARGE BETWEEN TWO ELECTRODES IS MEASURED IN-
- volts
- WHAT IS THE DIFFERENC BETWEEN A CONDUCTOR AND AN INSULATOR?
- a conductor allows electrons to move easily through it; an insulator does not.
- WHAT DO YOU NEED TO KNOW TO CALCULATE THE ELECTRICAL POWER USAGE FOR AN AN APPLIANCE?
- the valuses of the current and voltage
- RESISTANCE IN AN ELECTRICAL WIRE CAUSES ELECTRICAL ENERGY TO BE CONVERTED TO -
- thermal energy
- WHEN 2 NEGATIVE CHARGES COME CLOSE TOGETHER THEY WILL----
- repel
- WHEN DOES AN OBJECT BECOME POSITIVLEY CHARGED?
- when it loses electrons