Circuits Analysis and RC Circuits

Two capacitors of capacitance C₁ and C₂ are connected in parallel. What is the effective

capacitance?

• C₁C₂

• C₁+C₂

In the circuit shown, capacitor C is initially uncharged. At time t = 0, the switch S is closed.

Which of the following statements is correct regarding the charging of the capacitor?

• Immediately after S is closed, the current in the circuit rise slowly until a maximum

  value.

• Immediately after S is closed, the current in the circuit is a maximum, the current then

  decreases.

• The capacitor is fully charged after a time t = CR

• The current in the circuit at any time only depends on the resistance R and is

  independent of the capacitance C.

Tags

NGSS.HS-PS3-1

When a charged capacitor is connected in series with a filament lamp and a variable resistor,

the lamp lights up. The lamp will stay lighten for a period if the

• Resistance of the resistor is small

• Capacitance of the capacitor is large

• Resistance of the filament lamp is small

• Potential difference across the lamp is small

Capacitor is a device used to__________

• store electrical energy

• vary the resistance

• store magnetic energy

• dissipate energy

With respect to the capacitor, which relationship is true? •

• C = Q×V

• V = C×Q

• V = Q/C

• Q = C/V

Tags

NGSS.HS-PS2-4

A1 measures 50 milliamps.  A3 measures 20 milliamps.  What would A2 measure?

• 70 ma 
• 24 ma 
• 30 ma
• 50 ma

What is the voltage drop for each resistor?

• 9 V: all resistors have the same voltage in a parallel circuit
• 9V: there is only one resistor in this circuit
• Trick question! They all have different voltages!
• Trick question! They all have the same current!

The Voltage of resistor 1 is _____ V, and the resistance of resistor 3 is _____ Ohms.

• 10 V, 20 Ohms
• 30 V, 5 Ohms
• 10 V, 5 Ohms
• Not enough information to answer this question

There are four resistors in a series circuit with an applied voltage of 120V. The voltage drops across three resistors is 15V each. What is the voltage drop across the fourth resistor?

• 15V

• 45V

• 75V

• 120V