Hi, these questions are from my physics lab but I have no ideawhat they are sayi

Question

Hi, these questions are from my physics lab but I have no ideawhat they are saying. I hope someone can help me out here. Can youplease explain them in detail so that I understand fully that way Ican write it like I know what I'm talking about. Thank you. 1. When using an ohmmeter, is the current put out by the Fluke45 when used as an ohmeter LARGE or SMALL in comparison with therange of currents used in taking your data for the light bulb? (mydata stated that the rance of currents used was comparably LOW).Why? Justify your answer. 2. Give a definition of electrical resistance, using words aswell as symbols. (define any symbols used) 3. Please state Ohm's law using words, and in several ways ifyou can 4. Can a nonohmic device be made to seem ohmic byrestricting the range of voltages or currents used? 5. Make a guess as to what might happen to the graph for theresistor if we extended it to much larger values of volrage andcurrent. Please explain these for me. I have no idea how to answerthese. Thank you! Hi, these questions are from my physics lab but I have no ideawhat they are saying. I hope someone can help me out here. Can youplease explain them in detail so that I understand fully that way Ican write it like I know what I'm talking about. Thank you. 1. When using an ohmmeter, is the current put out by the Fluke45 when used as an ohmeter LARGE or SMALL in comparison with therange of currents used in taking your data for the light bulb? (mydata stated that the rance of currents used was comparably LOW).Why? Justify your answer. 2. Give a definition of electrical resistance, using words aswell as symbols. (define any symbols used) 3. Please state Ohm's law using words, and in several ways ifyou can 4. Can a nonohmic device be made to seem ohmic byrestricting the range of voltages or currents used? 5. Make a guess as to what might happen to the graph for theresistor if we extended it to much larger values of volrage andcurrent. Please explain these for me. I have no idea how to answerthese. Thank you!

Explanation / Answer

1) If the current from the ohmeter were large the bulb wouldlight when measuring its resistance.     Ohmeters are constructed to measureresistances using low current - otherwise the battery would quicklydie! 2) Electrical resistance is somewhat similar to water thru ahose. If the cross sectional area of the hose is large     (resistance) more water (current)will flow for a fixed water pressure (voltage). 3) Ohms Law: V = I R as resistance increases for a fixedcurrent then a larger voltage is required to maintain      the current or if the resistanceis constant a larger voltage is required to produce a largercurrent.      I = V / R   for a constantvoltage the current is inversely proportional to the resistanceand      for a constant resistance the voltageis proportional to the current in the circuit. 4) The graph of the current for an ohmic device is astraight line when plotting V versus R and       the slope of the graph givesyou the current. If the device in non-ohmic then the graphwould       be a curve with a varyingslope. Over small sections of the curve, however, the slope mightappear       to vary only slightly fromthat of a straight line. 5) Apparently, you were measuring a light bulb. If thevoltage (and current) were made larger the filament      of the bulb would heat up and itsresistance would increase so a graph of voltage versus currentwould no      longer be a straight line.

Related Questions

Navigate

• Browse (All)
• Browse H
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.