Electrical Systems Quiz

Which component of an electrical system is the energy source which transfers chemical potential energy to electrical energy to move electrons in the wire?

• cell

• electric charge

• current

• voltage

What is false about voltage?

• The amount of electrical energy needed to move a unit charge from one point to another point

• It is also known as voltage

• The unit is volt (V)

• Voltage is measured using a voltmeter in series to the component

2 non-identical light bulbs are arranged in parallel. Is the voltage across each of them the same?

• Yes

• No

Which of the following is false about cells?

• Greater voltages are obtained when cells are joined in series

• When two identical cells are connected in parallel, the voltage remains the same and both cells will last shorter

• When two identical cells are connected in opposite, the voltage across them is zero

• A 'battery' consists of two or more electric cells

Which is false about current?

• Current is the rate of flow of electric charges

• The unit of current is the ampere (A)

• Conventional current is the flow of positive charges from the negative terminal of a battery to its positive terminal

• Current can be measured using an ammeter connected in series

Current in any part of a series circuit is always the same.

• True

• False

What is false about resistance?

• Resistance, R, of an electrical component is a measure of how much the component opposes the flow of electric current

• Electrical insulators have very high resistance to current

• The SI unit of electrical resistance is the ohm (Ω)

• R = I/V

Which material is commonly used for heating elements in appliances like hair dryers and toasters?

• Nichrome

• Aluminum

• Copper

• Silver

What is false when a 2nd light bulb is added in series to the 1st light bulb?

• total resistance increases

• current decreases

• brightness decreases

• voltage increases

What is false when a 2nd light bulb is added in parallel to the 1st light bulb?

• total resistance decreases

• current decreases

• brightness increases

• voltage stays the same