Electricity & Circuits

What is current?

• The rate of flow of electrons through a conductor

• Potential difference between two points in a conductor

• Electrical energy needed to move the electric charges from one point to another point in a conductor

• Ability of a conductor to resist the flow of electric current

Which of the following is the symbol for resistor?

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Tags

NGSS.MS-ETS1-1

Which of the followings are the advantages of series circuit?

• All electrical appliance can be controlled with one switch

• Increasing the number of bulbs will not affect the brightness of the bulb

• When one bulb is removed, the others are still light up

• Increase in voltage supplies more electric current

__________________________ can be used to produce high voltage of direct current electricity and also imitate the production of lightning.

In a series circuit, the formula to calculate voltage is ________________________________

In a parallel circuit, the effective resistance can be calculated with the following formula:

• $R\ =\ R_{1\ }+\ R_2$

• $R\ =R_{1\ }=\ R_2$

• $\frac{1}{R}\ =\ \frac{1}{R_1}\ +\ \frac{1}{R_2}$

• $R\ =\ R_1\ \times\ R_2$

Which of the following is the correct diagram for the circuit shown in the picture?

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Which of the following formula(s) is CORRECT?

•  $V\ =\ IR$  

•  $R\ =\ VI$  

•  $I\ =\ \frac{V}{R}$  

•  $I\ =\ VR$  

•  $R\ =\ \frac{V}{I}$  

How can we decrease the resistance in a circuit?

• Increase the length of wire

• Use a thicker wire

• Remove a few bulbs

• Use an iron wire instead of a copper wire

What is the symbol for current?

• V

• R

• I

• C